European Hernia Society guidelines on the treatment of inguinal hernia in adult patients

 

## Prophylactic antibiotics
In open surgery, not recommended in low-risk patients. 

## Flow diagram for the treatment of inguinal hernia in male adults
Based on a consensus within the Committee.
(Oxford Centre for Evidence-Based Medicine) Levels of evidence:
1A Systematic review of randomised controlled trials (RCTs) with consistent results from individual (homogenous) studies. 1B RCTs of good quality. 2A Systematic review of cohort or case-control studies with consistent results from individual (homogenous) studies. 2B RCT of poorer quality or cohort or case-control studies. 2C Outcome studies, descriptive studies. [bib_ref] Surgical management of chronic pain after inguinal hernia repair, Aasvang [/bib_ref] Cohort or case-control studies of low quality. [bib_ref] Pain related sexual dysfunction after inguinal herniorrhaphy, Aasvang [/bib_ref] Expert opinion, generally accepted treatments.

## Grades of recommendation:
A Supported by systematic review and/or at least two RCTs of good quality. Level of evidence 1A, 1B. B Supported by good cohort studies and/or case-control studies.
Level of evidence 2A, 2B. C Supported by case series, cohort studies of low quality and/or 'outcomes' research. Level of evidence 2C, 3. D Expert opinion, consensus committee.
Level of evidence 4.

## All conclusions and recommendations:
Indications for treatment

# Conclusions

## Level 1b
Watchful waiting is an acceptable option for men with minimally symptomatic or asymptomatic inguinal hernias.

## Level 4
A strangulated inguinal hernia (with symptoms of strangulation and/or ileus) should be operated on urgently.

## Recommendations
Grade A It is recommended in minimally symptomatic or asymptomatic inguinal hernia in men to consider a watchful waiting strategy.
Grade D It is recommended that strangulated hernias are operated on urgently. It is recommended that symptomatic inguinal hernias are treated surgically.

## Non-surgical diagnostics
Conclusions Level 2C
In case of an evident hernia, clinical examination suffices. Differentiation between direct and indirect hernia is not useful. Only cases of obscure pain and/or doubtful swelling in the groin require further diagnostic investigation. In everyday practice, the sensitivity and specificity of ultrasonography for diagnosing inguinal hernia is low.
A computed tomography (CT) scan has a limited place in the diagnosis of an inguinal hernia. MRI has a sensitivity and specificity of more than 94% and is also useful to reveal other musculo-tendineal pathologies. Herniography has high sensitivity and specificity in unclear diagnosis but has a low incidence of complications. It does not reveal lipomas of the cord.

## Recommendations
Grade C It is recommended that groin diagnostic investigations are performed only in patients with obscure pain and/or swelling. The flow chart recommended in these cases:
Ultrasound (if expertise is available) If ultrasound negative ? MRI (with Valsalva) If MRI negative ? consider herniography

## Classification recommendations
Grade D It is recommended that the EHS classification for hernia in the groin is used.

## Risk factors and prevention

# Conclusions
Level 3
Smokers, patients with positive family hernia history, patent processus vaginalis, collagen disease, patients with an abdominal aortic aneurysm, after an appendicectomy and prostatectomy, with ascites, on peritoneal dialysis, after long-term heavy work or with COPD have an increased risk of inguinal hernia. This is not proven with respect to (occasional) lifting, constipation and prostatism.

## Recommendations
Grade C
Smoking cessation is the only sensible advice that can be given with respect to preventing the development of an inguinal hernia.

## Treatment of inguinal hernia
Conclusions Level 1A
Operation techniques using mesh result in fewer recurrences than techniques which do not use mesh.
The Shouldice hernia repair technique is the best non-mesh repair method. Endoscopic inguinal hernia techniques result in a lower incidence of wound infection, haematoma formation and an earlier return to normal activities or work than the Lichtenstein technique.
Endoscopic inguinal hernia techniques result in a longer operation time and a higher incidence of seroma than the Lichtenstein technique.

## Level 1b
Mesh repair appears to reduce the chance of chronic pain rather than increase it. Endoscopic mesh techniques result in a lower chance of chronic pain/numbness than the Lichtenstein technique. In the long term (more than 3 to 4 years follow-up), these differences (nonmesh-endoscopic-Lichtenstein) seem to decrease for the aspect pain but not for numbness. For recurrent hernias after conventional open repair, endoscopic inguinal hernia techniques result in less postoperative pain and faster reconvalescence than the Lichtenstein technique. Material-reduced meshes have some advantages with respect to long-term discomfort and foreign-body sensation in open hernia repair, but are possibly associated with an increased risk for hernia recurrence (possibly due to inadequate fixation and/or overlap) (Chap. 2.9).
From the perspective of the hospital, an open mesh procedure is the most cost-effective operation in primary unilateral hernias. From a socio-economic perspective, an endoscopic procedure is probably the most cost-effective approach for patients who participate in the labour market, especially for bilateral hernias. In cost-utility analyses including quality of life (QALYs), endoscopic techniques (TEP) may be preferable since they cause less numbness and chronic pain (Chap. 2.18).

## Level 2a
For endoscopic inguinal hernia techniques, TAPP seems to be associated with higher rates of port-site hernias and visceral injuries, whilst there appear to be more conversions with TEP.
Level 2B
There appears to be a higher rate of rare but serious complications with endoscopic repair, especially during the learning curve period. Other open mesh techniques: Prolene hernia system (PHS), Kugel patch, plug and patch (mesh plug) and Hertra mesh (Trabucco), in short-term follow-up, result in comparable outcome (recurrence) to the Lichtenstein technique. A young man (aged 18-30 years) with a lateral inguinal hernia has a risk of recurrence of at least 5% following a non-mesh operation and a long follow-up ([5 years) (Chap. 2.8).

## Level 2c
Endoscopic inguinal hernia techniques with a small mesh (B8 9 12 cm) result in a higher incidence of recurrence compared with the Lichtenstein technique. Women have a higher risk of recurrence (inguinal or femoral) than men following an open inguinal hernia operation due to a higher occurrence of femoral hernias (Chap. 2.7). The learning curve for performing endoscopic inguinal hernia repair (especially TEP) is longer than that for open Lichtenstein repair, and ranges between 50 and 100 procedures, with the first 30-50 being most critical (Chap. 2.12).
For endoscopic techniques, adequate patient selection and training might minimise the risks for infrequent but serious complications in the learning curve (Chap. 2.12). There does not seem to be a negative effect on outcome when operated by a resident versus an attending surgeon (Chap. 2.12). Specialist centres seem to perform better than general surgical units, especially for endoscopic repairs (Chap. 2.12).

## Level 4
All techniques (especially endoscopic techniques) have a learning curve that is underestimated. For large scrotal (irreducible) inguinal hernias, after major lower abdominal surgery, and when no general anaesthesia is possible, the Lichtenstein repair is the preferred surgical technique. For recurrent hernias, after previous posterior approach, an open anterior approach seems to have clear advantages, since another plane of dissection and mesh implantation is used. Stoppa repair is still the treatment of choice in case of complex hernias. The use of lightweight/material-reduced/largepore ([1,000-lm) meshes can be considered in open inguinal hernia repair to decrease longterm discomfort but possibly at the cost of increased recurrence rate (possibly due to inadequate fixation and/or overlap) (Chap. 2.9). It is recommended that an endoscopic technique is considered if a quick postoperative recovery is particularly important (Chap. 2.14). It is recommended that, from a hospital perspective, an open mesh procedure is used for the treatment of inguinal hernia (Chap. 2.18). From a socio-economic perspective, an endoscopic procedure is proposed for the active working population, especially for bilateral hernias (Chap. 2.18).

## Grade b
Other open-mesh techniques than Lichtenstein (PHS, Grade D For large scrotal (irreducible) inguinal hernias, after major lower abdominal surgery, and when no general anaesthesia is possible, the Lichtenstein repair is the preferred surgical technique. In endoscopic repair, a mesh of at least 10 9 15 cm should be considered. It is recommended that an anterior approach is used in the case of a recurrent inguinal hernia which was treated with a posterior approach. In female patients, the existence of a femoral hernia should be excluded in all cases of a hernia in the groin (Chap. 2.7).
A preperitoneal (endoscopic) approach should be considered in female hernia repair (Chap. 2.7). All surgeons graduating as general surgeons should have a profound knowledge of the anterior and posterior preperitoneal anatomy of the inguinal region (Chap. 2.12). Complex inguinal hernia surgery (multiple recurrences, chronic pain, mesh infection) should be performed by a hernia specialist (Chap. 2.12).

## Inguinal hernia in women

# Conclusions

## Level 2c
Women have a higher risk of recurrence (inguinal or femoral) than men following an open inguinal hernia operation due to a higher occurrence of femoral hernias.

## Recommendations

## Grade d
In female patients, the existence of a femoral hernia should be excluded in all cases of a hernia in the groin. A preperitoneal (endoscopic) approach should be considered in female hernia repair.
Lateral inguinal hernia in young men (aged 18-30 years)

# Conclusions

## Level 2b
A young man (aged 18-30 years) with a lateral inguinal hernia has a risk of recurrence of at least 5% following a non-mesh operation and a long follow-up ([5 years).

## Recommendations

## Grade b
It is recommended that a mesh technique is used for inguinal hernia correction in young men (aged 18-30 years and irrespective of the type of inguinal hernia).

# Biomaterials

# Conclusions

## Level 1a
Operation techniques using mesh result in fewer recurrences thantechniques which do not use mesh.

## Level 1b
Material-reduced meshes have some advantages with respect to long-term discomfort and foreign-body sensation in open hernia repair, but are possibly associated with an increased risk for hernia recurrence (possibly due to inadequate fixation and/or overlap).

## Recommendations

## Grade a
In inguinal hernia tension-free repair, synthetic non-absorbable flat meshes (or composite meshes with a non-absorbable component) should be used. The use of lightweight/material-reduced/largepore ([1,000-lm) meshes in open inguinal hernia repair can be considered to decrease long-term discomfort, but possibly at the cost of increased recurrence rate (possibly due to inadequate fixation and/or overlap).

## Day surgery

# Conclusions

## Level 2b
Inguinal hernia surgery as day surgery is as safe and effective as that in an inpatient setting, and more cost-effective.

## Level 3
Inguinal hernia surgery can easily be performed as day surgery, irrespective of the technique used. Selected older and ASA III/IV patients are also eligible for day surgery.

## Recommendations

## Grade b
An operation in day surgery should be considered for every patient.

## Antibiotic prophylaxis

# Conclusions

## Level 1a
In conventional hernia repair (non-mesh), antibiotic prophylaxis does not significantly reduce the number of wound infections. NNT 68.

## Level 1b
In open mesh repair in low-risk patients, antibiotic prophylaxis does not significantly reduce the number of wound infections. NNT 80 For deep infections, the NNT is 352. Level 2B
In endoscopic repair, antibiotic prophylaxis does not significantly reduce the number of wound infections. NNT ?.

## Recommendations
Grade A
In clinical settings with low rates (\5%) of wound infection, there is no indication for the routine use of antibiotic prophylaxis in elective open groin hernia repair in low-risk patients.

## Grade b
In endoscopic hernia repair, antibiotic prophylaxis is probably not indicated.

## Grade b
Use of spinal anaesthesia, especially using highdose and/or long-acting anaesthetic agents, should be avoided. General anaesthesia with short-acting agents and combined with local infiltration anaesthesia may be a valid alternative to local anaesthesia.

## Postoperative recovery

# Conclusions
Level 1A
Endoscopic inguinal hernia techniques result in an earlier return to normal activities or work than the Lichtenstein technique.

## Recommendations
Grade A It is recommended that an endoscopic technique is considered if a quick postoperative recovery is particularly important.

## Aftercare

# Conclusions

## Level 3
The imposition of a temporary ban on lifting, participating in sports or working after inguinal hernia surgery is not necessary. Probably a limitation on heavy weight lifting for 2-3 weeks is enough. Conclusions; treatment of chronic pain

## Recommendations

## Level 3
A multidisciplinary approach at a pain clinic is an option for the treatment of chronic postherniorrhaphy pain. Surgical treatment of specific causes of chronic post-herniorrhaphy pain can be beneficial for the patient, such as the resection of entrapped nerves, mesh removal in mesh-related pain, removal of endoscopic staples or fixating sutures.

## Recommendations
Grade A Grade C It is recommended that a multidisciplinary approach is considered for the treatment of chronic pain after hernia repair. It is recommended that the surgical treatment of chronic post-herniorrhaphy pain as a routine is restricted in the lack of scientific studies evaluating the outcome of different treatment modalities.

## Mortality

## Recommendations

## Grade b
It is recommended to offer patients with femoral hernia early planned surgery, even if the symptoms are vague or absent.
Grade D It is recommended to intensify efforts to improve the early diagnosis and treatment of patients with incarcerated and or strangulated hernia.

## Costs

# Conclusions

## Level 1b
From the perspective of the hospital, an open mesh procedure is the most cost-effective operation in primary unilateral hernias. From a socio-economic perspective, an endoscopic procedure is probably the most cost-effective approach for patients who participate in the labour market, especially for bilateral hernias. In cost-utility analyses including quality of life (QALYs), endoscopic techniques (TEP) may be preferable, since they cause less numbness and chronic pain.

## Recommendations
Grade A It is recommended that, from a hospital perspective, an open mesh procedure is used for the treatment of inguinal hernia. From a socio-economic perspective, an endoscopic procedure is proposed for the active working population, especially for bilateral hernias.

## General

# Introduction
One of the aims of the European Hernia Society (EHS) is the development and implementation of specialised medical guidelines for hernia management. Guidelines are not only important for clinical practice, but also for (postgraduate) training, the registration of complications and the development of indicators. The process of developing guidelines can also direct scientific research, as it indicates the areas in which there is a lack of evidence for clinical practice.
Guidelines are:
An agreed line of conduct for appropriate care within the professional group, which is based as much as possible on scientific insights from systematic and current clinical research into the efficacy and effectiveness of the available alternatives, taking the patient situation into account.
Guidelines are developed to:
-Improve medical quality and effectiveness (management) -Reduce the variation between physicians: the practice must be based more on evidence than on experiences or opinions (professionalism versus intuition) -Make practice more transparent (accountability: who can expect what from whom?)
Improving the results of inguinal hernia treatment will have major medical and economic consequences. For the patient, a successful inguinal hernia repair means a lower risk of complications, a quick postoperative recovery and a minimal risk of persistent pain symptoms or recurrent hernias. Of course, the individual patients' situation and the general costs of the treatment continue to be major considerations.
These guidelines concerning the treatment of inguinal hernia have been developed and are owned by the European Hernia Society (EHS). Development of the Guidelines was financed through a grant by Ethicon.

## Motivation
In 2003, the Dutch Society of Surgeons published evidence-based guidelines for the treatment of inguinal hernias. The Dutch Society of Hernia proposed in 2005 to have the Guidelines translated and have some international experts in the field judge whether the Guidelines could be suitable for use by the EHS. A Steering Committee was installed and, after reading and commenting on the contents, it was agreed that they would be used as the base for the EHS Guidelines. A Working Group was formed.
Ethicon agreed to sponsor the development. Ethicon would not become the owner and would not interfere in the methods and contents, thus, avoiding bias.
All member countries of the EHS were asked to name a representative to join the Working Group.

## Objective
These guidelines form a document with recommendations to support the daily practice of the treatment of inguinal hernias by surgeons. These guidelines are based on the results of scientific research and the formation of opinions arising from this which are aimed at emphasising good clinical practice. These guidelines are intended as a reference manual for daily practice. These guidelines provide starting points for the drawing up of local protocols, which promote their implementation and serve as a base or tool for education and training in groin hernia surgery. The potential health benefit is an improvement of the level of care for patients with inguinal hernia by reducing complications like recurrence and chronic pain.

## Definition
An inguinal hernia or hernia inguinalis is a protrusion of the contents of the abdominal cavity or preperitoneal fat through a hernia defect in the inguinal area, irrespective of whether this is preformed (congenital). This situation can give rise to complaints such as discomfort and pain. Sometimes, it is not possible to reduce the contents of the hernia sac (non-reducible hernia). In the case of a narrow hernia defect, there is a risk of the hernia sac contents becoming incarcerated, resulting in an obstruction of the intestine (ileus) and/or a circulatory disorder of the incarcerated content (strangulation), which can lead to necrosis and possible perforation of the intestine.
A recurrent inguinal hernia is a swelling due to a defect in the inguinal region where an inguinal hernia operation was previously performed.

## Target population
The target population was all adult ([18 years of age) patients with a primary or recurrent inguinal hernia (asymptomatic or symptomatic, acute or elective). The Guidelines concern male patients unless stated otherwise.

## Description of problem and initial questions
The committee which prepared these guidelines wished to gain answers to the following (deemed as the most important) questions that are known to give rise to discussion: All chapters were divided among participants and two were assigned to each. According to evidence-based medicine guidelines, the quality was assessed.
The concept chapters were discussed and, where necessary, consensus was found, after which recommendations were agreed upon.

## Legal significance
Guidelines are not legal requirements, but are evidence-based insights and recommendations in order to provide qualitatively good care. In this, it is important to realise that there are different ''levels of evidence,'' varying from the highest level (1A), which has been consistently demonstrated by systematic review, and the lowest level (4), which is only based on the opinion of experts. This results in different classes of recommendation. As these recommendations are based on the ''average patient,'' care providers can, where necessary, deviate from the guidelines in accordance with their professional opinion. Indeed, this can sometimes be necessary if the patient's situation requires that.
When the guidelines are not followed, this should be justified and documented.

## Intended (target) users
These guidelines are primarily intended for surgeons and trainee surgeons.
Some chapters are also intended for other providers, such as general practitioners, who wish to provide information to patients with an inguinal hernia. Level of evidence 4.

## Description of the implementation trajectory
For the Dutch Guidelines that were published in 2003, an implementation study and a pilot study among targetted users were performed. A national inventory of all inguinal hernia operations carried out in two periods was performed. The first period was a ''baseline measurement'' in the period prior to the publication of the Guidelines (January to March of 2001) and the second period was quite some time after the publication of the Guidelines (January to March of 2005). By means of the registration forms, the number of inguinal hernia operations carried out in all of the hospitals in these periods were counted (see registration form). The same system will be implemented on a European basis. A prospective database will be necessary for this. Plans for such a registration system are under development. In the Guidelines, operative methods and a registration form are proposed (Appendix 2). The EHS is developing a skills and teaching institute to facilitate and train surgeons and residents to be able to work according to the guidelines.

## Procedure for authorising guidelines with the european hernia society
Guidelines should be developed on the basis of results from scientific research and opinions related to this which are aimed at making good medical practice more explicit. In addition to this, there should be a broad level of support within the EHS.

## Applicability and costs
A pilot study among targetted users was performed in two large district hospitals in the Netherlands in 2002 [bib_ref] Do guidelines influence results in inguinal hernia treatment? A descriptive study of..., Aufenacker [/bib_ref]. There were no barriers to implementation either in costs or logistical possibilities. There are, possibly, European countries where certain hospitals cannot afford endoscopic hernia surgery.

## Expiry date
The Guidelines are valid until 1st January 2012. Updating of the Guidelines (RCT literature) will be performed continuously by the two authors of each chapter, with a yearly meeting at the EHS at which the publication of relevant updates will be decided upon.

## Validation
The Appraisal of Guidelines for REsearch and Evaluation (AGREE) instrument was used to validate the Guidelines.
Almost all criteria were fulfilled. Review was performed by four external experts in surgery and epidemiology. Two members of the Dutch Cochrane Institute performed a rigorous analysis, which led to many adjustments (Appendix 6).

## Guidelines for the treatment of inguinal hernia in adults
The groin is a naturally weak point in the abdominal wall. This weakness in the inguinal region is referred to anatomically as the myopectineal orifice of Fruchaud. Cranially and medially, this is bordered by the conjoined tendon and the rectus abdominis muscle, laterally by the iliopsoas muscle and caudally by the superior ramus of the os pubis [bib_ref] A prospective randomized study on inguinal hernia repair according to the Shouldice..., Friemert [/bib_ref]. This area is covered by the fascia transversalis, split into two by the inguinal ligament and penetrated by the spermatic cord (in men)/round ligament (in women) and femoral vessels. The integrity of the area is, therefore, determined solely by the fascia transversalis. Penetration of a peritoneal hernia sac (or preperitoneal lipoma) through the orifice is referred to as a hernia. The failure of the fascia transversalis to retain the peritoneum/preperitoneal fat is, therefore, the fundamental cause of an inguinal hernia. This fascia is weakened by congenital or acquired factors on the one hand and pressure increasing events on the other.
Inguinal hernias are corrected by repairing the fascial defect in the myopectineal orifice of Fruchaud or by reinforcing the weakened fascia transversalis and bridging the defect by inserting a prosthesis (mesh).

## Indications for treatment

## Authors: jean luc bouillot and maarten simons
What are the indications for a surgical treatment of inguinal hernia?
Can a non-surgical (conservative) treatment be considered?
Search terms: inguinal hernia, treatment.

# Conclusions

## Level 1b
Watchful waiting is an acceptable option for men with minimally symptomatic or asymptomatic inguinal hernias.

## Level 4
A strangulated inguinal hernia (with symptoms of strangulation and/or ileus) should be operated on urgently.

## Recommendations
Grade A It is recommended in minimally symptomatic or asymptomatic inguinal hernia in men to consider a watchful waiting strategy.
Grade D It is recommended that strangulated hernias are operated on urgently. It is recommended that symptomatic inguinal hernias are treated surgically.
The incidence and prevalence of inguinal hernia are not precisely known [bib_ref] Epidemiologic, economic, and sociologic aspects of hernia surgery in the United States..., Rutkow [/bib_ref]. The chance of a person having to undergo an inguinal hernia operation during his/her life is quite high, 27% in the case of men and 3% in the case of women [bib_ref] Inguinal hernia repair: incidence of elective and emergency surgery, readmission and mortality, Primatesta [/bib_ref]. As almost all diagnosed inguinal hernias are operated on, the natural course of an untreated inguinal hernia is scarcely known. Spontaneous recovery has never been described in adults.
An inguinal hernia is operated in order to reduce the symptoms, when acute complications occur or to prevent complications.

## Asymptomatic inguinal hernia
An asymptomatic inguinal hernia is operated on to prevent strangulation. An emergency operation due to a strangulated inguinal hernia has a higher associated mortality than an elective operation ([5 vs. \0.5%) [bib_ref] Danish Hernia Database Collaboration (2001) Quality assessment of 26,304 herniorrhaphies in Denmark:..., Bay-Nielsen [/bib_ref] [bib_ref] Mortality after groin hernia surgery, Nilsson [/bib_ref] , yet, it is not clear whether the elective operation of all inguinal hernias would have a significant impact on the life expectancy of patients with an inguinal hernia [bib_ref] Against the principle surgical indications in inguinal hernia, Post [/bib_ref]. The literature reveals that the majority of patients with strangulation either did not know they had an inguinal hernia or had not sought medical attention for their condition [bib_ref] Risk of strangulation in groin hernias, Gallegos [/bib_ref] [bib_ref] Timing of strangulation in adult hernias, Mcentee [/bib_ref] [bib_ref] Surgical operation rates: a twelve year experience in Stockton on Tees, Quill [/bib_ref] [bib_ref] A study of the risk of strangulation and obstruction in groin hernias, Rai [/bib_ref]. Furthermore, the chance of incarceration is sufficiently low (estimated to be 0.3-3% per year) that the policy of operating on every inguinal hernia, particularly in the case of elderly patients, could, in fact, lead to a higher morbidity and mortality [bib_ref] Risk of strangulation in groin hernias, Gallegos [/bib_ref] [bib_ref] Against the principle surgical indications in inguinal hernia, Post [/bib_ref].
Incarceration occurs at least ten times more often in the case of indirect hernias than direct hernias. However, it is difficult to clinically distinguish a indirect hernia from a direct hernia [bib_ref] Accuracy of clinical diagnosis of direct and indirect inguinal hernia, Kark [/bib_ref] [bib_ref] Evidence-based management of groin hernia in primary care-a systematic review, Mcintosh [/bib_ref] [bib_ref] How accurately can direct and indirect inguinal hernias be distinguished?, Ralphs [/bib_ref].
Two level 1B RCTs have been published, comparing operation versus watchful waiting.
In the Fitzgibbons trial, in which 356 men (over 18 years of age) were assigned to operation and 366 men were assigned to watchful waiting (WW), the main conclusions after 2 years of follow-up were: 23% crossover from WW to operation, one acute incarceration without strangulation within 2 years and one incarceration with bowel obstruction within 4 years [bib_ref] Watchful waiting vs repair of inguinal hernia in minimally symptomatic men: a..., Fitzgibbons [/bib_ref]. There were no differences in pain.
In the O'Dwyer trial, in which 80 men (over 55 years of age) were randomised to operation and 80 to WW, the main conclusions after 1 year of follow-up were: 23/80 (29%) patients crossed over from observation to operation and three serious hernia-related adverse events occurred in the WW group [bib_ref] Watchful waiting was as safe as surgical repair for minimally symptomatic inguinal..., O&apos;dwyer [/bib_ref]. One crossover patient had a postoperative myocardial infarction and died, one patient had a postoperative stroke and one patient had an acute hernia. Both patients that had a serious postoperative event had comorbid cardiovascular disease which had deteriorated significantly in the period under observation. Had they been operated on at presentation, such an event may have been avoided.
The results of both trials are not conclusive and differ slightly; however, watchful waiting is an acceptable option for men with asymptomatic or minimally symptomatic inguinal hernias. Incarcerations occur rarely. In one trial, it was concluded that (elderly) men with significant comorbidity could benefit from an operation electively in order to reduce the risks of increase in this morbidity and a higher (operative) mortality when operated in an emergency setting.

## Symptomatic/non-reducible inguinal hernia
Symptomatic inguinal hernias give rise to symptoms of discomfort and/or pain. Large hernias can give rise to cosmetic complaints. Symptomatic inguinal hernias are operated on electively to reduce complaints and/or to prevent complications. Non-reducible hernias without complaints of incarceration have a theoretically higher chance of strangulation.

## Strangulated inguinal hernia
Depending on the definition used, the rate of incarceration/ strangulation is estimated to be 0.3-3% per year [bib_ref] Risk of strangulation in groin hernias, Gallegos [/bib_ref] [bib_ref] What effect does the duration of an inguinal hernia have on patient..., Hair [/bib_ref] [bib_ref] Elective inguinal herniorrhaphy versus a truss in the elderly, Neuhauser [/bib_ref] [bib_ref] A study of the risk of strangulation and obstruction in groin hernias, Rai [/bib_ref]. There is possibly some increased risk accumulation during the first year after the hernia development [bib_ref] Risk of strangulation in groin hernias, Gallegos [/bib_ref] [bib_ref] A study of the risk of strangulation and obstruction in groin hernias, Rai [/bib_ref]. It is not possible to adequately assess the vitality of the strangulated hernia content by means of physical examination. Strangulated hernia is an indication for emergency surgical treatment.

## Non-surgical diagnostics

## Authors: giampiero campanelli and gyorgy weber
Which diagnostic modality is the most suitable for diagnosing inguinal hernia in patients with groin complaints (without clear swelling in the groin region)?
Search terms: inguinal hernia, diagnosis, herniography, MRI, ultrasound, CT scan, laparoscopy, combinations.

# Conclusions

## Level 2c
In case of an evident hernia, clinical examination suffices. Differentiation between direct and indirect hernia is not useful; only cases of obscure pain and/or doubtful swelling in the groin require further diagnostic investigation. In everyday practice, the sensitivity and specificity of ultrasonography for diagnosing inguinal hernia is low. A CT scan has a limited place in the diagnosis of an inguinal hernia. MRI has a sensitivity and specificity of more than 94% and is also useful to reveal other musculo-tendineal pathologies. Herniography has high sensitivity and specificity in unclear diagnosis, but has a low incidence of complications. It does not reveal lipomas of the cord.

## Recommendations
Grade C It is recommended that groin diagnostic investigations are performed only in patients with obscure pain and/or swelling. The flow chart recommended in these cases:
[formula] Ultrasound (if expertise is available) If ultrasound negative ? MRI (with Valsalva) If MRI negative ? consider herniography [/formula]

## Diagnosis
The diagnosis of inguinal hernia can be established by means of physical examination with a sensitivity of 74.5-92% and a specificity of 93% [bib_ref] Diagnosis and classification of inguinal hernias, Kraft [/bib_ref] [bib_ref] Detection of groin hernia with physical examination, ultrasound, and MRI compared with..., Van Den Berg [/bib_ref].
Doubts about the diagnosis can exist in the case of a vague groin swelling, vague localisation of the swelling, Differentiating the type of hernia (direct-indirect-femoral) using well-described anatomical landmarks is necessary only to diagnose femoral hernia, as this is important to prioritise an operation. Differentiating medial from lateral hernia is unreliable [bib_ref] Accuracy of clinical diagnosis of direct and indirect inguinal hernia, Kark [/bib_ref] [bib_ref] Evidence-based management of groin hernia in primary care-a systematic review, Mcintosh [/bib_ref] [bib_ref] How accurately can direct and indirect inguinal hernias be distinguished?, Ralphs [/bib_ref]. Almost all of these patients will proceed to surgical exploration and repair. There are almost no studies with a good diagnostic gold standard because only patients with a positive finding undergo surgery.

## Ultrasonography
Ultrasonography is a useful non-invasive adjunct to physical examination. In clinical occult groin hernia, ultrasound specificity in relation to surgical exploration is 81-100%, its sensitivity is 33% and up to 100% in clinical diagnosis of a groin hernia [bib_ref] The accuracy of ultrasound in the diagnosis of clinically occult groin hernias..., Alam [/bib_ref] [bib_ref] The groin hernia-an ultrasound diagnosis?, Bradley [/bib_ref] [bib_ref] Ultrasound of the inguinal floor for evaluation of hernias, Lilly [/bib_ref] [bib_ref] Inguinofemoral hernia: accuracy of sonography in patients with indeterminate clinical features, Robinson [/bib_ref] [bib_ref] Value of sonography in diagnosis of uncertain lesions of the abdominal wall..., Truong [/bib_ref] [bib_ref] Detection of groin hernia with physical examination, ultrasound, and MRI compared with..., Van Den Berg [/bib_ref].

## Ct scan
CT scan does not have a significant role in the diagnosis of inguinal hernia, even though it has a sensitivity of 83% and a specificity of 67-83% [bib_ref] CT in the diagnosis of abdominal wall hernias: a preliminary study, Hjer [/bib_ref].
It is useful in the rare case of involvement of the urinary bladder [bib_ref] Bilateral scrotal extraperitoneal herniation of ureters: computed tomography urographic findings and review..., Akpinar [/bib_ref] [bib_ref] Inguinoscrotal bladder herniation: is CT a useful tool in diagnosis?, Andac [/bib_ref] [bib_ref] Bladder cancer within a direct inguinal hernia: CT demonstration, Caterino [/bib_ref] [bib_ref] Radiological anatomy of the groin region, Van Den Berg [/bib_ref].

## Mri
The advantage of MRI is that other pathologies can also be diagnosed (inflammation, tumour) [bib_ref] MR imaging following herniography in patients with unclear groin pain, Leander [/bib_ref].
MRI can show an accurate and early diagnosis of the different sport-related pathologies [bib_ref] Groin pain in athletes: role of magnetic resonance, Barile [/bib_ref].
MRI imaging can be used to perform imaging in any plane and dynamic examinations during straining. Its sensitivity is 94.5% and specificity is 96.3% [bib_ref] Detection of groin hernia with physical examination, ultrasound, and MRI compared with..., Van Den Berg [/bib_ref].

## Herniography
Herniography is safe, sensitive (100%) and specific (98-100%) in occult hernia [bib_ref] Value of herniography in the management of occult hernia and chronic groin..., Calder [/bib_ref] [bib_ref] Is herniography useful?, Garner [/bib_ref] [bib_ref] Unexplained groin pain: safety and reliability of herniography for the diagnosis of..., Gwanmesia [/bib_ref] [bib_ref] Evaluation of herniography in the diagnosis of an occult abdominal wall hernia..., Hall [/bib_ref] [bib_ref] Peritoneography (herniography) for detecting occult inguinal hernia in patients with inguinodynia, Heise [/bib_ref] [bib_ref] A negative herniogram does not exclude the presence of a hernia, Loftus [/bib_ref].
Herniography does not identify a potential lipoma of the cord which can cause groin pain and/or obscure swelling.
In many articles, a good reference standard (operation) is lacking. For 12-54% of the herniographies which are carried out in patients without swelling, a hernia is diagnosed [bib_ref] Herniography: a review of 333 herniograms, Hamlin [/bib_ref].
An occult hernia can be found with herniography in 25% athletes with long-standing undefined groin pain [bib_ref] Herniographic findings in athletes with unclear groin pain, Kesek [/bib_ref].
The risk of complications is 0-4.3%, and these include contrast allergy, puncture of the intestine, abdominal wall haematoma and short-lasting pain [bib_ref] Herniography: a review of 333 herniograms, Hamlin [/bib_ref] [bib_ref] Herniography in the investigation of groin pain in adults, Jones [/bib_ref] [bib_ref] Herniography: a prospective, randomized study between midline and left iliac fossa puncture..., Nadkarni [/bib_ref]. In cases of obscure pain in the groin with an uncertain diagnosis of inguinal hernia, an initial time of 4 months (in the absence of clinical deterioration) is worthwhile before proceeding to herniography [bib_ref] Value of herniography in the management of occult hernia and chronic groin..., Calder [/bib_ref].

## Differential diagnosis
The differential diagnosis of the swelling in the groin:
[formula] -Inguinal (recurrent) hernia -Femoral hernia -Incisional hernia -Lymph gland enlargement -Aneurysm -Varix (vena saphena magna) -Soft-tissue tumour -Abscess -Genital anomalies (ectopic testis) -Endometriosis [/formula]
The differential diagnosis in pain without typical swelling:
-Adductor tendinitis -Pubic osteitis -Hip artrosis -Bursitis Ileopectinea -Irradiating low back pain -Endometriosis

## Classification

## Author: giampiero campanelli
Is it necessary to classify inguinal hernias and which classification is the most suitable?
Search terms: inguinal hernia, classification.

## Recommendations

## Grade d
It is recommended that the EHS classification for hernia in the groin is used.
An unequivocal classification of inguinal hernias is important for the rational choice of treatments (in case of tailored surgery) and for the analysis of scientific data. It is also possible to compare the various treatments in clinical trials when hernias can be classified in an unequivocal manner.
Current inguinal hernia classifications are numerous: traditional (medial/lateral/recurrent), Nyhus, Gilbert, Rutkow/Robbins, Schumpelick, Harkins, Casten, Halverson and McVay, Lichtenstein, Bendavid, Stoppa, Alexandre, Zollinger Unified [bib_ref] Inguinal hernia recurrence: classification and approach, Campanelli [/bib_ref] [bib_ref] Classification of groin hernia: milestones, Nyhus [/bib_ref] [bib_ref] Classification systems for groin hernias, Zollinger [/bib_ref].
As it is important that a classification system is simple to use and remember, the guidelines committee advises the EHS classification [bib_ref] The European hernia society groin hernia classification: simple and easy to remember, Miserez [/bib_ref]. This classification can be found on the website of the EHS European Hernia Society Classification EHS Groin Hernia Classification
[formula] Primary/recurrent 0 1 2 3 X Lateral (L) Medial (M) [/formula]
Femoral (F)
One classification system for recurrent hernia has been described by Campanelli et al. [bib_ref] Inguinal hernia recurrence: classification and approach, Campanelli [/bib_ref].

## Risk factors and prevention

## Authors: maciej smietanski and jean luc bouillot
What are the risk factors for developing an inguinal hernia and are there preventive measures?
Search terms: inguinal hernia, risk factors.

# Conclusions

## Level 3
Smokers, patients with positive family hernia history, patent processus vaginalis, collagen disease, patients with an abdominal aortic aneurysm, after an appendicectomy and prostatectomy, with ascites, on peritoneal dialysis, after long-term heavy work or with COPD have an increased risk of inguinal hernia. This is not proven with respect to (occasional) lifting, constipation and prostatism.

## Recommendations

## Grade c
Smoking cessation is the only sensible advice that can be given with respect to preventing the development of an inguinal hernia.
Textbooks mention many risk factors for the development of an inguinal hernia or a recurrence. Smoking is almost certainly a risk factor [bib_ref] Prevalence of aortic aneurysm in men with a history of inguinal hernia..., Pleumeekers [/bib_ref] [bib_ref] Smoking is a risk factor for recurrence of groin hernia, Sorensen [/bib_ref]. People with abnormal collagen metabolism (also known among smokers) have an increased risk, which is also revealed in a higher incidence of inguinal hernias in patients with aortic aneurysm. Also, patent processus vaginalis is a risk factor [bib_ref] High coincidence of inguinal hernias and abdominal aortic aneurysms, Lehnert [/bib_ref] [bib_ref] Prevalence of aortic aneurysm in men with a history of inguinal hernia..., Pleumeekers [/bib_ref] [bib_ref] Patent processus vaginalis in the adult as a risk factor for the..., Van Veen [/bib_ref]. Abnormal collagen metabolism possibly clarifies the fact that there are families with an abnormally large number of hernias of all types [bib_ref] Altered collagen synthesis in fascia transversalis of patients with inguinal hernia, Klinge [/bib_ref]. In one casecontrol study, the family history of hernia seems to be the only independent risk factor of hernia [bib_ref] Risk factors for inguinal hernia in adult males: a case-control study, Lau [/bib_ref]. Chronic coughing (COPD) seems to be a risk factor [bib_ref] Risk factors associated with inguinal hernias: a case control study, Carbonell [/bib_ref].
Additional risk has not been demonstrated for prostatism and constipation. Although the majority of studies reveal that physical work is not a risk factor, two retrospective case-control studies revealed that long-term and heavy work does increase the risk of hernias [bib_ref] Risk factors associated with inguinal hernias: a case control study, Carbonell [/bib_ref] [bib_ref] Inguinal hernia and certain risk factors, Flich [/bib_ref]. A case-control study among women did not demonstrate this, and this was also the case for smoking, whereas many sports and obesity were protecting factors. In this study, constipation and a positive family history were positive risk factors [bib_ref] Risk factors for inguinal hernia in women: a case-control study. The Coala..., Liem [/bib_ref]. A low (cosmetic) incision for appendectomy can disrupt the shutter mechanism and increase the risk of an inguinal hernia on the right-hand side [bib_ref] A neuromuscular basis for development of indirect inguinal hernia, Tobin [/bib_ref].
Ascites and peritoneal dialysis can increase the risk of inguinal hernia or a recurrence thereof [bib_ref] Metastatic emphysema: a mechanism for acquiring inguinal herniation, Cannon [/bib_ref] [bib_ref] Ambulatory peritoneal dialysis and hernial complications, Engeset [/bib_ref] [bib_ref] Management of inguinal hernia on peritoneal dialysis: an audit of current Polish..., Smietanski [/bib_ref].
The only pragmatic prevention for an inguinal hernia is smoking cessation and possibly not undertaking long-term and heavy physical work.
Known factors for the development of a recurrent inguinal hernia are: technique (see the next chapter), type of hernia (direct higher risk than indirect) and recurrent inguinal hernia (the more frequently a recurrence occurs, the higher the risk of a new recurrence).
Inguinal hernia is a known complication after radical retropubic prostatectomy, open procedure as well as endoscopic, and has been reported to occur in 7-21% of patients [bib_ref] Postoperative inguinal hernia after radical prostatectomy for prostate cancer, Abe [/bib_ref] [bib_ref] Inguinal hernia after radical retropubic prostatectomy for prostate cancer: a study of..., Lodding [/bib_ref] [bib_ref] Inguinal hernia in stage M0 prostate cancer: a comparison of incidence in..., Stranne [/bib_ref] [bib_ref] Post-radical retropubic prostatectomy inguinal hernia: an analysis of risk factors with special..., Stranne [/bib_ref] [bib_ref] Inguinal hernia is a common complication in lower midline incision surgery, Stranne [/bib_ref]. Even other types of lower midline incision surgery could promote the development of postoperative inguinal hernia [bib_ref] Ejaculatory pain: a specific postherniotomy pain syndrome?, Aasvang [/bib_ref] [bib_ref] Inguinal hernia is a common complication in lower midline incision surgery, Stranne [/bib_ref]. Urologists should be aware of this important postoperative complication and prophylactic surgical procedures must be evaluated to address the problem.

## Treatment of inguinal hernia

## Authors: marc miserez, maarten simons and theo aufenacker
What is the best technique for treating an inguinal hernia taking into account the type of hernia and the patient?
Search terms: RCT, hernia and specific names of the surgical techniques (46 combinations in total) in Medline, Cochrane library, references, correspondence and unpublished results.

# Background
Treatment of inguinal hernias An inguinal hernia is treated when acute complications occur (such as incarceration, strangulation and ileus), to reduce the symptoms and to prevent complications. The aim of treating an inguinal hernia is to reduce the symptoms by repairing the inguinal hernia with minimum discomfort for the patient and in the most cost-effective manner. Hernias can only be cured by surgical repair. An accurate dissection of the inguinal canal provides insight into the anatomy of the hernia. During the reduction, the content of the hernia sac is placed back into the peritoneal cavity. The peritoneal hernia sac is resected or reduced into the preperitoneal space.
The inguinal canal is restored by repairing the defect in the posterior wall by means of a so-called tissue suture technique or by covering the defect with synthetic material. Polypropylene mesh is usually the synthetic material of choice.
All of the tissue surgery techniques bear the name of the surgeon who promoted the method concerned (Marcy, Bassini, Halsted, McVay, Shouldice), as is also the case for the majority of prosthetic techniques with mesh (Lichtenstein, Stoppa, Wantz, Rutkow/Robbins), whereas, currently, often only the type of operation is stated (plug and patch, PHS, TEP, TAPP).
Techniques Conventional suturing technique (nonmesh) Bassini described the first rational hernia operation in 1884 but, unfortunately, his original operation was modified and corrupted. Not until 1950 was the modern version of the original Bassini procedure described by Shouldice, in which the posterior wall of the inguinal canal and the internal ring were repaired by means of sutures in several layers with a continuous non-soluble monofilament suture. Recent randomised research has shown that the Shouldice technique is considerably better than the nonoriginal Bassini technique and the Marcy technique (simple narrowing of the internal ring) with recurrence percentages in the long term of 15, 33 and 34%, respectively [bib_ref] Longterm followup (12-15 years) of a randomized controlled trial comparing Bassini-Stetten, Shouldice,..., Beets [/bib_ref]. The Bassini technique and Marcy's technique are, therefore, obsolete.
The Shouldice technique is the best conventional treatment for primary inguinal hernia [bib_ref] Role of the Shouldice technique in inguinal hernia repair: a systematic review..., Simons [/bib_ref]. In experienced hands and specialised clinics, the results are very good (recurrence rates 0.7-1.7%). In general practice, the results are less satisfying, with recurrence rates in the long term of 1.7-15% [bib_ref] Longterm followup (12-15 years) of a randomized controlled trial comparing Bassini-Stetten, Shouldice,..., Beets [/bib_ref] [bib_ref] Role of the Shouldice technique in inguinal hernia repair: a systematic review..., Simons [/bib_ref].
Mesh technique The approximation of tissues which do not normally lie against each other results in abnormal tension between these tissues. All classical sutured inguinal hernia operations share this factor-tension on the repair. This may result in ischaemia, which gives rise to pain, necrosis, tearing of sutures and a recurrent hernia. Fur-thermore, there are indications that some patients with inguinal hernias have an abnormal collagen metabolism, particularly in the elderly. The reinforcement of these tissues by synthetic material has become the established method. The concept of a tension-free repair of the defect had already emerged at the end of the 19th century, but a suitable biomaterial in the form of polypropylene mesh only became available in 1960. The mesh material now most commonly used is a flat sheet of monopropylene.
The prosthetic repair of a defect in the posterior wall of the inguinal canal can be carried out in two fundamentally different manners. The defect is blocked with a plug or a larger, flat mesh prosthesis is placed over the fascia transversalis. Prostheses can be inserted into the groin anteriorly via an inguinal incision or posteriorly in the preperitoneal space via a classic open approach or along the endoscopic route.
Mesh: anterior open approach Tension-free repair of inguinal hernia has been strongly promoted since 1984 by Lichtenstein [bib_ref] The tension-free hernioplasty, Lichtenstein [/bib_ref]. Via an inguinal incision, preferably under local anaesthetic, the polypropylene mesh is sutured to the posterior wall of the inguinal canal with considerable overlap. The mesh is positioned between the internal oblique muscle and the aponeurosis of the external oblique and is sutured to the inguinal ligament. Crucial is the adequate overlap of the posterior wall of the inguinal canal, especially 2 cm medial to the pubic tubercle, although a very low risk routine exploration of the femoral canal is advised, especially in the absence of an inguinal hernia and women. Different meshes or other devices were developed: mesh-plug (plug placed deep into the inguinal ring/medial defect, mesh placed on the posterior wall of the inguinal canal), PHS (device covering three spaces: preperitoneal space, deep inguinal ring/medial defect, posterior wall of the inguinal canal), Hertra sutureless mesh (Trabucco). Rives used a transinguinal approach to place the mesh preperitonealy.
Mesh: posterior open approach The posterior approach to the entire myopectineal orifice of Fruchaud via an abdominal incision with the insertion of a large prosthesis completely overlapping all orifices has been popularised by Stoppa since 1980 [bib_ref] The use of Dacron in the repair of hernias of the groin, Stoppa [/bib_ref]. were the first to come up with the idea, and Stoppa (for bilateral recurrent inguinal hernias) and Wantz developed it for unilateral inguinal hernia [bib_ref] Properitoneal prosthetic placement through the groin. The anterior (Mahorner-Goss, Rives-Stoppa) approach, Read [/bib_ref]. The Stoppa technique is still the treatment of choice in the case of complex hernias (bilateral and several recurrences) [bib_ref] Long-term results of giant prosthetic reinforcement of the visceral sac for complex..., Beets [/bib_ref]. Another technique was developed using a specific mesh type . Kugel preperitoneal open mesh placement in the short term provides results comparable to the Lichtenstein technique [bib_ref] Comparison of Kugel and Lichtenstein operations for inguinal hernia repair: results of..., Dogru [/bib_ref] [bib_ref] Minimally invasive, nonlaparoscopic, preperitoneal, and sutureless, inguinal herniorrhaphy, Kugel [/bib_ref].
Mesh: posterior endoscopic approach Since 1990, the Stoppa technique has been performed endoscopically, by means of both the transperitoneal (TAPP) and preperitoneal (TEP) approaches [bib_ref] Comparison of conventional anterior surgery and laparoscopic surgery for inguinalhernia repair, Liem [/bib_ref].
Just as 100 years ago, many of these new techniques have been modified and corrupted. In 2007, there are countless variants concerning the approach, technique and prosthetic material, with comparable short-term results.
Theoretical considerations Theoretically, Lichtenstein mesh is on the wrong side of the hernia defect. The preperitoneal insertion of a large mesh which seals off the entire myopectineal orifice of Fruchaud from the inside would, therefore, in theory, seem to be the best treatment for inguinal hernia. The tensions which have caused the hernia keep the mesh in place, in accordance with Pascal's law. Furthermore, if the operation can take place by means of a minimally invasive (endoscopic) method, the ideal operation would seem to be a reality.
In the case of recurrent hernias, a new, previously unused approach is preferable to the previous route. In order to place a prosthesis well, an ample dissection is required. Reoperation via an inguinal incision increases the risk of haemorrhage and wound infection, damage to cutaneous nerves or damage to the spermatic cord. When a recurrence occurs after an operation via an inguinal incision, reoperation via the posterior preperitoneal approach is preferable. The opposite is true for recurrent hernias after abdominal or endoscopic preperitoneal operations. Then, an inguinal approach is safer and easier. For bilateral hernias, and certainly if a (bilateral) recurrence is involved, a posterior (endoscopic) preperitoneal approach is preferred.
The evolution in the treatment of inguinal hernia from the Bassini technique to the open mesh and endoscopic techniques has led to more than 100 randomised studies in which an attempt has been made to establish the most efficient and effective treatment technique.

## Literature study
Search terms: RCT, hernia and specific names of the surgical techniques (46 combinations in total) in Medline, Cochrane library, references, correspondence and unpublished results. The results were published in the British Journal of Surgery, the Annals of Surgery, the Cochrane Library, Surgical Endoscopy, Hernia etc.
Systematic reviews and a meta-analysis were carried out by the EU Hernia Trialists Collaboration concerning the risk of recurrences, complications, postoperative recovery, grade of difficulty (learning curve) and costs .
All of the following factors need to be considered when choosing a treatment [bib_ref] Comparison of biomaterials in the early postoperative period, Langenbach [/bib_ref] :
-Risk of recurrence -Safety (risk of complications) -Postoperative recovery and quality of life (resumption of work) -Grade of difficulty and reproducibility (learning curve) -Costs (hospital and societal costs)
Results from the literature concerning techniques for inguinal hernia repair The Shouldice technique is the best non-mesh repair for primary inguinal hernia [bib_ref] Role of the Shouldice technique in inguinal hernia repair: a systematic review..., Simons [/bib_ref]. The Lichtenstein technique, introduced in 1984, is currently the best evaluated and most popular of the different open-mesh techniques: it is reproducible with minimal perioperative morbidity, it can be performed in day care (under local anaesthesia) and has low recurrence rates (B4%) in the long term [bib_ref] Open ''tensionfree'' repair of inguinal hernias: the Lichtenstein technique, Amid [/bib_ref] [bib_ref] The tension-free hernioplasty, Lichtenstein [/bib_ref].
Mesh or non-mesh? A systematic review of RCTs by the Cochrane Collaboration/EU Hernia Trialists Collaboration in 2002 and 2003 showed strong evidence that fewer hernias recur after mesh repair than following nonmesh repair, with a separate analysis for the Shouldice repair. Mesh appears to reduce the chance of chronic pain rather than increase it [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref] [bib_ref] Open mesh versus non-mesh for repair of femoral and inguinal hernia, Scott [/bib_ref]. Bittner stated that there was no difference in the recurrence rate for the Shouldice repair versus endoscopic techniques, in contrast to other suture repairs that were clearly inferior to endoscopic techniques with respect to the recurrence rate [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref]. The incidence of chronic groin pain was clearly lower in the endoscopic techniques versus Shouldice (2.2 vs. 5.4%; P \ 0.00007) and other non-mesh repairs (3.9 vs. 9.0%; P \ 0.00001).
Since then, three RCTs comparing the Shouldice and Lichtenstein techniques have been published [bib_ref] Long-term results of a randomized clinical trial of Shouldice, Lichtenstein and transabdominal..., Butters [/bib_ref] [bib_ref] A prospective trial of primary inguinal hernia repair by surgical trainees, Miedema [/bib_ref] [bib_ref] Randomized trial of Lichtenstein versus Shouldice hernia repair in general surgical practice, Nordin [/bib_ref]. One additional trial compared open non-mesh and Lichtenstein techniques and reported the results on recurrence with a more than 10-year follow-up period [bib_ref] Long-term follow-up of a randomized clinical trial of non-mesh versus mesh repair..., Van Veen [/bib_ref]. Recurrence rates were clearly higher after the Shouldice procedure in those four trials, except for the trial by Miedema et al. In this latter trial, where the surgery was performed by first-and second-year residents under the supervision of an experienced general surgeon, the rate of severe chronic pain was also clearly increased in the mesh group.
After conventional repair, recurrences can be expected to occur several years postoperatively and increase with a prolonged follow-up. With various mesh techniques, a recurrence is frequently demonstrated early in the follow-up due to technical failure. It is not known whether the incidence of chronic pain might decrease with longer follow-up. To determine the results in the long term, we performed an additional meta-analysis comparing the Shouldice repair with different mesh techniques in all trials with a follow-up of more than 3 years [fig_ref] Table 3: Long-term follow-up [/fig_ref]. Above data demonstrates that a mesh technique is superior regarding recurrence but not at the expense of more pain. [bib_ref] Laparoscopic surgery for inguinal hernia repair: systematic review of effectiveness and economic..., Mccormack [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref]. Schmedt made a specific comparison between endoscopic procedures (TAPP and TEP) and only Lichtenstein as the open mesh technique.
Significant advantages for endoscopy include lower incidence of wound infection, haematoma and chronic pain/numbness, with earlier return to normal activities or work (6 days). The McCormack review found heterogeneity among RCTs in the length of hospital stay. There were greater differences in the mean length of stay between different hospitals than between different operative techniques, possibly reflecting differences in health care systems versus differences due to types of endoscopic repair. An earlier meta-analysis (possibly outdated) had shown a small (3.4 h) decrease in hospital stay in favour of endoscopic repair [bib_ref] Meta-analysis of randomized clinical trials comparing open and laparoscopic inguinal hernia repair, Memon [/bib_ref]. A very recent systematic review comparing open mesh and suture repair versus endoscopic TEP also showed a shorter hospital stay in 6/11 trials [bib_ref] Open or endoscopic total extraperitoneal inguinal hernia repair? A systematic review, Kuhry [/bib_ref].
Significant advantages for Lichtenstein included shorter operation time (by 8-13 min), lower incidence of seroma and recurrences. The latter was strongly influenced by the Veterans Affairs (VA) Multicenter Trial, where the minimum mesh size in endoscopic surgery was 7.6 9 15 cm (see below) [bib_ref] Open mesh versus laparoscopic mesh repair of inguinal hernia, Neumayer [/bib_ref]. When this study is excluded, there is no difference in the recurrence rates between open and endoscopic surgery.
There also appears to be a higher rate of rare but serious complications with respect to major vascular and visceral (especially bladder) with the endoscopic approach. Most of these lesions were seen with TAPP (0.65 vs. 0-0.17% for TEP and open mesh repair). The transabdominal route of TAPP might also cause more adhesions, leading to intestinal obstruction in a small number of cases [bib_ref] Transabdominal pre-peritoneal (TAPP) versus totally extraperitoneal (TEP) laparoscopic techniques for inguinal hernia..., Mccormack [/bib_ref]. In a separate evaluation of potentially lethal complications, the investigators conclude that no significant differences were found, but a definitive statistical evaluation was not possible due to the low incidence of these complications. A specific meta-analysis comparing TAPP versus TEP (including eight non-randomised studies) states that there is insufficient data to allow conclusions to be drawn, but suggests that, indeed, TAPP is associated with higher rates of port-site hernias and visceral injuries, whilst there appear to be more conversions with TEP [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref]. Additional recent publications of RCTs comparing TEP versus Lichtenstein confirm the data from the two meta-analyses, except for the shorter operation time with Lichtenstein [bib_ref] Short-term results of a randomized clinical trial comparing Lichtenstein open repair with..., Eklund [/bib_ref] [bib_ref] Day-case endoscopic totally extraperitoneal inguinal hernioplasty versus open Lichtenstein hernioplasty for unilateral..., Lau [/bib_ref].
The best investigated anterior approach is the Lichtenstein repair and the best posterior is the endoscopic repair. For same reason as mentioned above, we performed an additional meta-analysis of long-term follow-up concerning pain and recurrence. Since many trials publish short-term results about pain and because the prevalence of pain diminishes after a longer time period, the best comparison between the two techniques mentioned is with long-term follow-up. Therefore, [fig_ref] Table 4: Long-term follow-up [/fig_ref] demonstrates the data of all trials with a follow-up of over 48 months. When performing a meta-analysis (see figures) on the data with a minimum of 4 years follow-up, a random analysis is used because of the clinical and methodological diversity. The Lichtenstein technique performs slightly but not significantly better concerning the recurrence OR of 1.16 (95% CI: 0.63-2.16), but does have a non-significant trend towards more severe pain OR of 0.48 (95% CI: 0.11-2.06).
The difficulty in the pain area is, of course, the large variation in definitions and, therefore, any firm statement regarding this topic remains difficult. These data seem to confirm the comparable recurrence rates in the long term for both open and endoscopic mesh repairs. In addition, the incidence of (severe) chronic pain between both groups seems to equalise with time. Only numbness seems to persist [bib_ref] Long-term results of a randomized clinical trial of Shouldice, Lichtenstein and transabdominal..., Butters [/bib_ref] [bib_ref] Laparoscopic versus open groin hernia repair: meta-analysis of randomised trials based on..., Grant [/bib_ref].
Long-term follow-up ([48 months) of RCTs comparing endoscopic mesh techniques (TEP/TAPP) with Lichtenstein repair: When a mesh-based repair is chosen, the best approach to the groin is under debate. This is mainly caused by discussion about recurrence on one hand and chronic pain on the other.
With adequate surgical technique and training, the recurrence rate (after endoscopic operations) can be reduced significantly. The higher recurrence rate for the endoscopic repair in some papers (compared with the other publications) might be related to the size of the mesh used, which is currently considered to be too small: the 8-cm minimum height of the mesh in the VA Multicenter Trial or a mesh size of 7 9 12 cm [bib_ref] Laparoscopic compared with open hernia surgery: complications, recurrences and current trends, Arvidsson [/bib_ref] [bib_ref] Open mesh versus laparoscopic mesh repair of inguinal hernia, Neumayer [/bib_ref]. A recent publication of a multicentric trial in France with more than 300 patients and a follow-up period of more than 2 years also showed higher recurrence rates with endoscopic repair (especially for direct hernias: 27.3 vs. 6.5% for Shouldice repair performed in 90% of cases); in 69% of the patients treated endoscopically, a mesh of dimensions B8 9 12 cm was used [bib_ref] Inguinal hernia repair. A randomized multicentric study comparing laparoscopic and open surgical..., Millat B; Federation De Recherche [/bib_ref].

## Results of non-lichtenstein open-mesh techniques
The small studies (short follow-up) describing the use of these methods provided comparable results for recurrence to the Lichtenstein technique [bib_ref] Is there a need for a mesh plug in inguinal hernia repair?..., Adamonis [/bib_ref] [bib_ref] Lichtenstein vs. Rutkow-Robbins technique in the treatment of primary inguinal hernia. Analysis..., Bolognini [/bib_ref] [bib_ref] Randomized clinical trial of Lichtenstein's operation versus mesh plug for inguinal hernia..., Frey [/bib_ref] [bib_ref] Lichtenstein patch or Perfix plug-andpatch in inguinal hernia: a prospective double-blind randomized..., Kingsnorth [/bib_ref] [bib_ref] Prolene Hernia System compared with Lichtenstein patch: a randomised double blind study..., Kingsnorth [/bib_ref] [bib_ref] Pain after anterior mesh hernia repair, Nienhuijs [/bib_ref] [bib_ref] Randomized controlled trial comparing prolene hernia system and lichtenstein method for inguinal..., Sanjay [/bib_ref]. Longer follow-up data on recurrence/chronic pain are missing at the present time.
RCTs concerning non-Lichtenstein mesh repairs:Year of publication [bib_ref] Prospective randomized trial of laparoscopic (transabdominal preperitoneal) vs open (mesh) repair for..., Mahon [/bib_ref]. Thus, in bilateral hernias, a sufficiently large mesh should be used or two different meshes (e.g. 15 9 13 cm on both sides).
For recurrent hernias, the endoscopic approach after previous open repair (and vice versa) seems to have clear advantages, since another plane of dissection and mesh implantation is used. In an RCT comparing TEP versus TAPP versus Lichtenstein after previous conventional open repair, the endoscopic approach significantly increased the operative time (only TEP) but reduced perioperative complications, postoperative pain, analgesic requirement and time to return to normal activities [bib_ref] Comparison of laparoscopic and open tension-free repair of recurrent inguinal hernias: a..., Dedemadi [/bib_ref]. Another study comparing TAPP and Lichtenstein showed less postoperative pain and shorter sick leave for the endoscopic group [bib_ref] Recurrent inguinal hernia: randomized multicenter trial comparing laparoscopic and Lichtenstein repair, Eklund [/bib_ref]. The recurrence rate in both groups after 5 years was 18-19% (94% FU) and also the incidence of chronic pain was comparable (although a lack of congruent definitions was reported and the size of the mesh in endoscopic repair of 7 9 12 cm is currently considered to be too small).
For large scrotal (irreducible) inguinal hernias, after major lower abdominal surgery, previous radiotherapy of pelvic organs and when no general anaesthesia is possible, the Lichtenstein repair is the generally accepted treatment.
For any male patient treated with a large preperitoneal mesh, future prostatic surgery might be more problematic. Therefore, it is suggested that a rectal examination and PSA screening should be considered in all male patients between 40 and 70 years of age before proceeding to a preperitoneal mesh placement [bib_ref] Laparoscopic inguinal hernia repair complicates future pelvic oncologic surgery, Hsia [/bib_ref].
In the future, more detailed long-term evaluation with further well-structured and adequately powered RCTs with improved standardisation of hernia type, operative technique and surgeons' experience and the definition of major endpoints is necessary.

## Inguinal hernia in women

## Authors: joachim conze and morten bay nielsen
Following a non-mesh inguinal hernia operation, is the risk of recurrence lower for women than for men? Should women be treated with a different strategy?
Search terms: inguinal hernia, treatment, women, female.

# Conclusions

## Level 2c
Women have a higher risk of recurrence (inguinal or femoral) than men following an open inguinal hernia operation due to a higher occurrence of femoral hernias.

## Recommendations

## Grade d
In female patients, the existence of a femoral hernia should be excluded in all cases of a hernia in the groin. A preperitoneal (endoscopic) approach should be considered in female hernia repair.
Women account for 8-9% of all inguinal and femoral hernia operations performed. In subgroup analyses from many studies, the recurrence rate of a non-mesh inguinal hernia operation in women seems to be comparable to that after type I and type II (EHS) inguinal hernia operations in men (2-13%), dependent on the follow-up duration [bib_ref] Lotheissen-McVay repair of hernia. Late follow-up analysis after 1202 operations for inguinal..., Dudda [/bib_ref] [bib_ref] Bassini operation with polyglycolic acid or polyester. A prospective randomized study of..., Fuchsjager [/bib_ref] [bib_ref] Late results following inguinal or femoral hernia surgery, Herzog [/bib_ref] [bib_ref] 10 years' experience using a modified Shouldice surgical technic for inguinal hernia..., Ris [/bib_ref]. In epidemiological studies from national databases, reoperation rates after female herniorrhaphy are higher, compared to males, without any difference between anterior mesh and non-mesh repairs [bib_ref] Inguinal herniorrhaphy in women, Bay-Nielsen [/bib_ref] [bib_ref] Prospective evaluation of 6895 groin hernia repairs in women, Koch [/bib_ref]. In approximately 40% of reoperations, a femoral recurrence is found. It is not known whether these femoral 'recurrences' represent hernias overlooked at the primary operation or de novo hernias. The high frequency of femoral recurrence after inguinal herniorrhaphy in women argues for the use of endoscopic repair, covering both the inguinal and femoral orifices simultaneously.

## Lateral inguinal hernia in young men (aged 18-30 years)

## Authors: morten bay nielsen and joachim conze
Does a young man have a very low risk of recurrence following a non-mesh inguinal hernia operation due to an indirect hernia? Is mesh treatment indicated for this category of patients?
Search terms: inguinal hernia, treatment.

# Conclusions

## Level 2b
A young man (aged 18-30 years) with a lateral inguinal hernia has a risk of recurrence of at least 5% following a non-mesh operation and a long follow-up ([5 years).

## Recommendations

## Grade b
It is recommended that a mesh technique is used for inguinal hernia correction in young men (18-30 years of age and irrespective of the type of inguinal hernia).
In view of the discussion concerning the risk of recurrence in young men following a non-mesh inguinal hernia operation due to a lateral inguinal hernia and the concern for fertility issues, this category deserves to be considered in a separate chapter. About 5% of all inguinal hernia operations are performed on men between the ages of 18 and 30 years. Indirect inguinal hernias account for the majority of these operations. From studies (level 3 and 4), it is known that after 2 to 5 years of follow-up, the risk of recurrence after Shouldice repair is 1-3% lower than for an operation due to a direct inguinal hernia. For this category of patients, Friis and Lindahl compared a Lichtenstein and an annuloraphy and saw recurrence rates of 0 and 2.2%, respectively, with 2 years of follow-up after the repair of a primary hernia [bib_ref] The tension-free hernioplasty in a randomized trial, Friis [/bib_ref]. In a randomised study after a followup of more than 10 years, Beets et al. described recurrence rates of more than 30% for an indirect inguinal hernia after both an annuloraphy as well as a modified Bassini technique [bib_ref] Longterm followup (12-15 years) of a randomized controlled trial comparing Bassini-Stetten, Shouldice,..., Beets [/bib_ref]. In a retrospective series of more than 1,000 annuloraphies for a lateral inguinal hernia, the recurrence rate rose to 18% after a follow-up of 10 years [bib_ref] Long-term results of repair of the internal ring for primary inguinal hernia, Jess [/bib_ref]. Analysis of data from the Danish Hernia Database shows a reoperation rate almost twice as high after non-mesh repairs compared to Lichtenstein and other open mesh repairs in males \30 years of age, operated for a primary indirect hernia (unpublished data).
In a questionnaire study, in patients below 55 years of age operated for an indirect hernia, no relevant difference in chronic pain was found between patients operated with mesh and non-mesh techniques and no study has shown specific mesh-related problems in this subgroup of patients [bib_ref] Swedish Hernia Data Base the Danish Hernia Data Base (2004) Chronic pain..., Bay-Nielsen [/bib_ref]. In summary, there is no evidence to support a nonmesh approach in this subgroup of patients.

# Biomaterials

## Authors: jan kukleta and joachim conze
What mesh type is the most suitable in inguinal hernia repair, and what mesh-related complications can occur?
Search terms: mesh, biomaterial, inguinal hernia, mesh complications.

# Conclusions

## Level 1a
Operation techniques using mesh result in fewer recurrences than techniques which do not use mesh.

## Level 1b
Material-reduced meshes have some advantages with respect to long-term discomfort and foreign-body sensation in open hernia repair, but are possibly associated with an increased risk for hernia recurrence (possibly due to inadequate fixation and/or overlap).

## Recommendations

## Grade a
In inguinal hernia tension-free repair, synthetic non-absorbable flat meshes (or composite meshes with a non-absorbable component) should be used. The use of lightweight/material-reduced/largepore ([1,000-lm) meshes in open inguinal hernia repair can be considered to decrease long-term discomfort, but possibly at the cost of increased recurrence rate (possibly due to inadequate fixation and/or overlap).
The use of synthetic mesh substantially reduces the risk of hernia recurrence irrespective of the placement method. Mesh repair appears to reduce the chance of persisting pain rather than increase it.
Only non-absorbable meshes or composite meshes with a non-absorbable component should be used in inguinal hernia repair in adults.
There is a great variety of meshes available differing in textile parameters (polymer, filament, construction, pore size, elasticity, tensile strength, weight, surface). We do not know the parameters of the ideal mesh. The use of mesh can be related to some non-specific complications (pain, infection, recurrence) and some specific complications (shrinkage, dislocation, migration, erosion). In open inguinal hernia repair, the use of a monofilament polypropylene mesh is advised to reduce the chance of incurable chronic sinus formation or fistula which can occur in patients with a deep infection. The chance of complete wound healing after adequate drainage is virtually impossible when a multifilament mesh is used as bacteria ( 1 lm) can hide from the leucocytes ( [10 lm) because the mesh has a closer weave structure with a smaller pore diameter ( 10 lm) and the mesh cannot be 'sterilised.' [bib_ref] Chronic groin sepsis following tension-free inguinal hernioplasty, Taylor [/bib_ref].
Weight-reduced mesh materials ([1,000 lm), macroporous and oligofilament structures seem to shrink less, cause less inflammatory reaction and induce less extensive scar-tissue formation and are, therefore, more likely to be integrated with less long-term discomfort and foreign-body sensation when implanted in open hernia repair but, possibly, they are associated with an increased risk for hernia recurrence [bib_ref] Three-year results of a randomized clinical trial of lightweight or standard polypropylene..., Bringman [/bib_ref] [bib_ref] Impact of polypropylene amount on functional outcome and quality of life after..., Horstmann [/bib_ref] [bib_ref] Early results for new lightweight mesh in laparoscopic totally extra-peritoneal inguinal hernia..., Khan [/bib_ref] [bib_ref] Randomized clinical trial assessing impact of a lightweight or heavyweight mesh on..., O&apos;dwyer [/bib_ref] [bib_ref] Randomized clinical trial of lightweight composite mesh for Lichtenstein inguinal hernia repair, Post [/bib_ref] in high-risk conditions (large direct hernia), if the mesh is not adequately fixed and/or overlapping.
There is not sufficient data on sexual dysfunction in relation to the variable properties of different prosthetic materials or different surgical techniques used.

## Day surgery

## Authors: maciej smietanski and rene fortelny
Can inguinal hernia surgery be performed in a day surgery setting? Is this safe and cost-effective?
Search terms: (groin or inguinal) hernia, ambulatory, day surgery, random* in PubMed; function: related articles in PubMed; literature lists of relevant articles.

# Conclusions

## Level 2b
Inguinal hernia surgery as day surgery is as safe and effective as that in an inpatient setting, and more cost-effective.

## Level 3
Inguinal hernia surgery can easily be performed as day surgery, irrespective of the technique used. Selected older and ASA III/IV patients are also eligible for day surgery.

## Recommendations

## Grade b
An operation in day surgery should be considered for every patient.
Daysurgeryisanadmissiontoaunitforadiagnosticortherapeutic treatment by a medical specialist, in which discharge takes place on the same day after a period of recovery under (para)medical supervision. An inguinal hernia repair performedintheoutpatientdepartmentunderlocalanaesthetic, in which thepatient goeshome shortlyafterthe intervention, is consideredtobedaysurgery.
As early as 1955, the advantages of inguinal hernia repair as day surgery were already described in the literature: quicker mobilisation, patient-friendly and lower costs [bib_ref] Early ambulation; with special reference to herniorrhaphy as an outpatient procedure, Farquharson [/bib_ref]. Some time later, from the end of the 1970s onwards, several retrospective series were published [bib_ref] Operations for hernia and varicose veins in a day-bed unit, Goulbourne [/bib_ref] [bib_ref] Comparison of outpatient and inpatient operations for inguinal hernia (1971 to 1978)..., Michelsen [/bib_ref] , as well as two small randomised studies in which day surgery was compared with inpatient treatment [bib_ref] Randomized clinical trial of one-day surgery. Patient satisfaction, clinical outcomes, and costs, Pineault [/bib_ref] [bib_ref] Economic aspects of day care after operations for hernia or varicose veins, Prescott [/bib_ref] [bib_ref] Day care after operations for hernia or varicose veins: a controlled trial, Ruckley [/bib_ref]. A recent randomised study compared how much patients valued different treatments [bib_ref] Patient acceptance of outpatient treatment for inguinal hernia in Jos, Nigeria, Ramyil [/bib_ref]. These studies showed that day surgery is just as safe and effective, and, in addition, cheaper. In two of the three studies, patients were at least as content with day surgery [bib_ref] Patient acceptance of outpatient treatment for inguinal hernia in Jos, Nigeria, Ramyil [/bib_ref] [bib_ref] Day care after operations for hernia or varicose veins: a controlled trial, Ruckley [/bib_ref]. In a large American cohort study, the costs of an inguinal hernia repair in a clinical setting were found to be 56% higher than those for day surgery [bib_ref] Costs and outcomes of inpatient versus outpatient hernia repair, Mitchell [/bib_ref]. Also in Germany, this procedure is generating less costs [bib_ref] section sign) 115 b SGB V threatens outpatient treatment for inguinal hernia...., Weyhe [/bib_ref]. In addition to the few randomised studies, there are a multitude of cohort studies concerning patients successfully operated on as day surgery, under general, regional and local anaesthetics, and with both classical operation techniques as well as open tension-free repairs and endoscopic techniques. A large study conducted in Denmark noted the hospital readmission rate of 0.8% [bib_ref] Return hospital visits and morbidity within 60 days after day surgery: a..., Engbaek [/bib_ref] [bib_ref] section sign) 115 b SGB V threatens outpatient treatment for inguinal hernia...., Weyhe [/bib_ref]. Although a tension-free repair under local anaesthetic seems to be the most suitable operation, the published series showed that other surgical and anaesthesiological techniques can also be effectively used as day surgery. Only the extensive open preperitoneal approach (Stoppa technique) has not been described in the context of day surgery.
When day surgery was in its infancy, there was a strict selection of patients with a low risk of complications (ASA I-II, age limit, length of operation \1 h, no serious obesity etc.). Such a strict selection is becoming less common and, in principle, an inguinal hernia repair as day surgery can be considered for every patient who has satisfactory care at home [bib_ref] Obesity and day-case surgery, Davies [/bib_ref] [bib_ref] Day care surgery, Jarrett [/bib_ref]. In this consideration, the preoperative assessment of the anaesthetist is extremely important, because he/she carries the main responsibility for the perioperative and immediately postoperative phase . A number of factors will either encourage or discourage day surgery. These include hospital, physician and patientrelated factors. In a hospital with considerable experience in day surgery and a good infrastructure, such as the presence of a pre-assessment consultation and a day surgery department, a large percentage of inguinal hernia treatments will take place as day surgery. The same applies to surgical factors, such as quick operations with a low percentage of complications, and anaesthesia factors, such as pain alleviation and nausea control, which make a quick discharge possible.
On a worldwide basis, there is a clear increase in the percentage of inguinal hernia repairs that are being carried out as day surgery [bib_ref] How much ambulatory surgery in the World in 1996-1997 and trends, De Lathouwer [/bib_ref] [bib_ref] Day care surgery, Jarrett [/bib_ref]. There is considerable variation between different countries, which cannot be clarified solely by the degree of acceptability of day surgery among patients and surgeons but, to a significant extent, is also determined by the healthcare financing system. In the last years , 35% of inguinal hernia operations carried out in the Netherlands and 33% in Spain were done on a day surgery basis [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref] ; there is room for this number to be increased. In the Swedish National Registry, 75% of inguinal hernia repairs are performed in day care.

## Antibiotic prophylaxis

## Authors: theo aufenacker and maarten simons
Is antibiotic prophylaxis routinely indicated for elective inguinal surgery for primary inguinal hernia?
Search terms: hernia, antibiotic prophylaxis, RCT, systematic review.

# Conclusions

## Level 1a
In conventional hernia repair (non-mesh), antibiotic prophylaxis does not significantly reduce the number of wound infections. NNT 68.

## Level 1b
In open mesh repair in low-risk patients, antibiotic prophylaxis does not significantly reduce the number of wound infections. NNT 80. For deep infections, the NNT is 352.

## Level 2b
In endoscopic repair, antibiotic prophylaxis does not significantly reduce the number of wound infections. NNT ?.

## Recommendations

## Grade a
In clinical settings with low rates (\5%) of wound infection, there is no indication for the routine use of antibiotic prophylaxis in elective open groin hernia repair in low-risk patients.

## Grade b
In endoscopic hernia repair, antibiotic prophylaxis is probably not indicated.

## Grade c
In the presence of risk factors for wound infection based on patient (recurrence, advanced age, immunosuppressive conditions) or surgical (expected long operating times, use of drains) factors, the use of antibiotic prophylaxis should be considered.
The risk of infection following an inguinal hernia operation, with or without mesh, is between 0 and 14.4%. In RCTs, the average incidence of wound infections is 4.3% in conventional repair and 2.4% in open mesh repair [bib_ref] Polyglycolic acid, silk, and topical ampicillin. Their use in hernia repair and..., Andersen [/bib_ref] [bib_ref] The role of antibiotic prophylaxis in prevention of wound infection after Lichtenstein..., Aufenacker [/bib_ref] [bib_ref] The role of antibiotic prophylaxis on wound infection after mesh hernia repair..., Celdran [/bib_ref] [bib_ref] The reduction of surgical wound infections by prophylactic parenteral cephaloridine. A controlled..., Evans [/bib_ref] [bib_ref] Local antibiotic prophylaxis in inguinal hernia repair, Lazorthes [/bib_ref] [bib_ref] Utility of antibiotic prophylaxis in reducing wound infection in inguinal or femoral..., Morales [/bib_ref] [bib_ref] Antibiotic prophylaxis in inguinal herniaplasty, Oteiza [/bib_ref] [bib_ref] A randomized, doubleblind, placebo-controlled trial to determine effectiveness of antibiotic prophylaxis for..., Perez [/bib_ref] [bib_ref] Perioperative antibiotic prophylaxis for herniorrhaphy and breast surgery, Platt [/bib_ref] [bib_ref] Antibiotic prophylaxis for hernia repair, Sanchez-Manuel [/bib_ref] [bib_ref] Is there an indication for general perioperative antibiotic prophylaxis in laparoscopic plastic..., Schwetling [/bib_ref] [bib_ref] Antibiotic prophylaxis and open groin hernia repair, Taylor [/bib_ref] [bib_ref] The role of antibiotic prophylaxis in elective tension-free mesh inguinal hernia repair:..., Tzovaras [/bib_ref] [bib_ref] Effect of single-dose prophylactic ampicillin and sulbactam on wound infection after tension-free..., Yerdel [/bib_ref].
Since the use of antibiotics is not likely to increase the percentage of wound infection, the net effect of randomised controlled studies will almost always be in favour of the patients receiving prophylaxis.
In a meta-analysis on the use of antibiotic prophylaxis in 1,867 patients with non-mesh repairs, the overall infection rates were 2.88% in the prophylaxis group and 4.30% in the control group (OR 0.65, 95% CI: 0.35-1.21) [bib_ref] Antibiotic prophylaxis for hernia repair, Sanchez-Manuel [/bib_ref]. This is a non-significant reduction with a number needed to treat of 68.
In two meta-analyses on the use of antibiotic prophylaxis in open mesh-based groin repairs, conflicting conclusions are drawn [bib_ref] Systematic review and meta-analysis of the effectiveness of antibiotic prophylaxis in prevention..., Aufenacker [/bib_ref] [bib_ref] Prophylactic antibiotics for mesh inguinal hernioplasty: a metaanalysis, Sanabria [/bib_ref]. In these two analyses, the same six studies are included but in one, the analysis is fixed and in the other, it was random [bib_ref] The role of antibiotic prophylaxis in prevention of wound infection after Lichtenstein..., Aufenacker [/bib_ref] [bib_ref] The role of antibiotic prophylaxis on wound infection after mesh hernia repair..., Celdran [/bib_ref] [bib_ref] Utility of antibiotic prophylaxis in reducing wound infection in inguinal or femoral..., Morales [/bib_ref] [bib_ref] Antibiotic prophylaxis in inguinal herniaplasty, Oteiza [/bib_ref] [bib_ref] A randomized, doubleblind, placebo-controlled trial to determine effectiveness of antibiotic prophylaxis for..., Perez [/bib_ref] [bib_ref] Effect of single-dose prophylactic ampicillin and sulbactam on wound infection after tension-free..., Yerdel [/bib_ref]. The choice of the correct method should be based on the prevalence of statistical heterogeneity (data), together with the clinical diversity and methodological diversity of the studies.
In the six studies, there is no statistical heterogeneity but clinical and methodological diversity is present and, therefore, the random method should be used. When the results of fixed and random analysis conflict, the choice of meta-analysis method should be preferably conservative and, in these situations, the random method should be used.
Currently, eight studies regarding open mesh repair are available; the results are displayed in [fig_ref] Table 7: Results of individual studies on the use of antibiotic prophylaxis in the... [/fig_ref] [bib_ref] The role of antibiotic prophylaxis in prevention of wound infection after Lichtenstein..., Aufenacker [/bib_ref] [bib_ref] The role of antibiotic prophylaxis on wound infection after mesh hernia repair..., Celdran [/bib_ref] [bib_ref] The role of antibiotic prophylaxis in mesh repair of primary inguinal hernias..., Jain [/bib_ref] [bib_ref] Utility of antibiotic prophylaxis in reducing wound infection in inguinal or femoral..., Morales [/bib_ref] [bib_ref] Antibiotic prophylaxis in inguinal herniaplasty, Oteiza [/bib_ref] [bib_ref] A randomized, doubleblind, placebo-controlled trial to determine effectiveness of antibiotic prophylaxis for..., Perez [/bib_ref] [bib_ref] The role of antibiotic prophylaxis in elective tension-free mesh inguinal hernia repair:..., Tzovaras [/bib_ref] [bib_ref] Effect of single-dose prophylactic ampicillin and sulbactam on wound infection after tension-free..., Yerdel [/bib_ref].
In summary, one study found a significant decrease in infections. This study revealed no difference between deep infections and reported a very high percentage of superficial infections, possibly caused by long duration of operation, more usage of drains and repeated aspiration of seromas.
The results of the meta-analysis (random effect) of 3,006 patients with mesh-based groin repair are an overall infection rate of 1.6% in the prophylaxis group and 3.1% in the control group (OR 0.59, 95% CI: 0.34-1.03). This is not a significant reduction, with a number needed to treat of 80 [fig_ref] Figure 5: Pooled data of eight studies on the use of antibiotic prophylaxis in... [/fig_ref].
For the prevention of a deep infection, data is available on 2,103 patients. The deep infection rate is 0.3% in the prophylaxis group and 0.6% in the placebo group (OR 0.50, 95% CI: 0.12-2.09). The reduction is not significant and the number needed to treat is 352 to prevent one deep infection.

## Authors: marc miserez and maarten simons
What is the learning curve and training in inguinal hernia repair?
Search terms: hernia, training, learning curve.

# Conclusions

## Level 2c
The learning curve for performing endoscopic inguinal hernia repair (especially TEP) is longer than that for open Lichtenstein repair, and ranges between 50 and 100 procedures, with the first 30-50 being the most critical. For endoscopic techniques, adequate patient selection and training might minimise the risks for infrequent but serious complications in the learning curve. There does not seem to be a negative effect on outcome when operated by a resident versus an attending surgeon. Specialist centres seem to perform better than general surgical units, especially for endoscopic repairs.

## Recommendations
Grade C (Endoscopic) hernia training with adequate mentoring should be started with junior residents.
Grade D All surgeons graduating as general surgeons should have a profound knowledge of the anterior and posterior preperitoneal anatomy of the inguinal region. Complex inguinal hernia surgery (multiple recurrences, chronic pain, mesh infection) should be performed by a hernia specialist.
Surgeons recognise technical issues, experiences in deciding to act and manual skills as major predictors of outcome. A learning curve for a specific procedure can be evaluated by means of operative times, but mainly by the rate of conversions (for endoscopic surgery) and complications. It is generally believed that the learning curve for performing endoscopic inguinal hernia repair is longer than for open Lichtenstein repair, although the Lichtenstein technique also has a learning curve with respect to the prevention of recurrence and the prevention of chronic groin pain. However, this learning curve seems to be more favourable than that for the endoscopic techniques [bib_ref] Learning curve for ''tension-free'' reparation of inguinal hernia, Tocchi [/bib_ref]. This is especially the case for TEP, due to a limited working space and different appreciation of the usual anatomical landmarks seen from inside the peritoneal cavity or through an anterior approach. The risk of serious complications may be higher during the learning curve period, and adequate patient selection and training might minimise the risks for rare but serious complications.
Very limited data are available on the learning curves for endoscopic repair, but it is suggested that operators become experienced after between 50 and 100 procedures, with the first 30-50 being the most critical [bib_ref] Laparoscopic transperitoneal procedure for routine repair of groin hernia, Bittner [/bib_ref] [bib_ref] Laparoscopic herniorrhaphy: beyond the learning curve, Deturris [/bib_ref] [bib_ref] Laparoscopic hernia repair: the learning curve, Edwards Cc 2nd [/bib_ref] [bib_ref] The impact of the surgeon's experience on the results of laparoscopic hernia..., Feliu-Pala [/bib_ref] [bib_ref] Learning curve for unilateral endoscopic totally extraperitoneal (TEP) inguinal hernioplasty, Lau [/bib_ref] [bib_ref] The learning curve for totally extraperitoneal laparoscopic inguinal hernia repair, Liem [/bib_ref] [bib_ref] The learning curve in laparoscopic inguinal hernia repair for the community general..., Voitk [/bib_ref] [bib_ref] Transabdominal pre-peritoneal (TAPP) vs totally extraperitoneal (TEP) laparoscopic techniques for inguinal hernia..., Wake [/bib_ref]. Lamb et al. showed for TEP that recurrence rates (median follow-up time 7 years) are \2% if more than 80 procedures had been performed and, recently, the learning curve specifically for TAPP was suggested to be [75 [bib_ref] Laparoscopic transabdominal preperitoneal (TAPP) hernia repair: surgical phases and complications, Lovisetto [/bib_ref]. Of course, this number is clearly dependent on the structure of the training (programme), such as the type of supervision and the expertise of the trainer [bib_ref] The learning curve for totally extraperitoneal laparoscopic inguinal hernia repair, Liem [/bib_ref]. The number of 250, especially in surgeons aged 45 years and above as reported in the VA trial, has been criticised because of several reasons (learning curve effect, size of the mesh) [bib_ref] Inguinal hernia repair in general surgical practice in 2004: more than laparoscopy,..., Miserez [/bib_ref] [bib_ref] Open mesh versus laparoscopic mesh repair of inguinal hernia, Neumayer [/bib_ref] [bib_ref] Proficiency of surgeons in inguinal hernia repair: effect of experience and age, Neumayer [/bib_ref].
There is a substantial variation in the amount of training and supervision given for inguinal hernia repair and, currently, an increased number of complications during the learning curve period due to nonoptimal training conditions is no longer acceptable [bib_ref] Inguinal hernia repair: see one, do one, teach one?, Davies [/bib_ref]. Although there are no RCTs concerning hernia surgery that compare the outcome of trainee versus surgeon or specialist, most surgical data, even on pancreatic surgery, show no negative effect on outcome when operated by a resident versus an attending surgeon [bib_ref] Analysis of surgical complications and patient outcomes in a residency training program, Coates [/bib_ref] [bib_ref] Does the participation of a surgical trainee adversely impact patient outcomes? A..., Hutter [/bib_ref] [bib_ref] Supervised surgical trainees can perform pancreatic resections safely, Praseedom [/bib_ref] [bib_ref] Safety of surgical procedures performed by residents, Shaked [/bib_ref]. Of course, the quality and extent of supervision is an important factor in outcome [bib_ref] Tepas JJ 3rd (1993) Resident supervision in the operating room: does this..., Fallon [/bib_ref]. Registration in a prospective database in Scotland showed that junior residents, when supervised by a senior resident or a consultant surgeon (for open surgery) and senior residents, whether supervised or unsupervised (for open and endoscopic surgery), obtained comparable recurrence rates as the consultant surgeons [bib_ref] Effects of training and supervision on recurrence rate after inguinal hernia repair, Robson [/bib_ref]. More or less comparable data on morbidity and recurrence rate (although associated with a higher operation time for residents) were found for the Lichtenstein procedure [bib_ref] Surgical training and inguinal hernia repair, Rozon [/bib_ref]. In a retrospective analysis of 264 TEP interventions, mainly performed by surgical residents under the guidance of a single staff surgeon, the mean operation time was 85 min (unilateral hernias) and the recurrence rate was 2%, with a mean follow-up of 3.5 years [bib_ref] Totally extraperitoneal (TEP) approach for inguinal hernia: the favorable learning curve for..., Haidenberg [/bib_ref]. In a TAPP inguinal hernia repair, the learning curve seemed to be shorter for junior trainees than for the senior surgeons (who were training them now) years before [bib_ref] Laparoscopic transperitoneal procedure for routine repair of groin hernia, Bittner [/bib_ref]. Other conflicting data state that surgical training for endoscopic treatment of inguinal hernias is associated with a longer operation time and hospital stay, and with higher morbidity and costs [bib_ref] Effects of surgical education and training on the results of laparoscopic treatment..., Barrat [/bib_ref]. For the Lichtenstein repair, a post-hoc analysis of the VA trial data (where surgical residents assisted during the whole operation by an attending surgeon who performed most of the repairs) showed higher recurrence rates (but not other complications) for junior residents operating versus senior residents. For the endoscopic repair, the attending effect was so important that no resident effects on the recurrence and complication rates could be detected [bib_ref] Does resident post graduate year influence the outcomes of inguinal hernia repair, Wilkiemeyer [/bib_ref]. (Endoscopic) hernia training with adequate mentoring should, therefore, probably be started with junior residents.
Specialist centres seem to perform better than general surgical units, especially for endoscopic repairs and complex inguinal hernia surgery (multiple recurrences, chronic pain, mesh infection etc.) should, thus, be best performed by a hernia specialist [bib_ref] Laparoscopic transperitoneal procedure for routine repair of groin hernia, Bittner [/bib_ref] [bib_ref] Current status of the debate on laparoscopic hernia repair, O&apos;dwyer [/bib_ref] [bib_ref] Totally extraperitoneal endoscopic inguinal hernia repair (TEP), Tamme [/bib_ref]. It is unclear whether subspeciality training, centre volume and/or surgeon volume are equally important to determine the outcome [bib_ref] Is volume related to outcome in health care? A systematic review and..., Halm [/bib_ref] , but for many procedures, the observed associations between hospital volume and operative mortality are largely mediated by surgeon volume [bib_ref] Surgeon volume and operative mortality in the United States, Birkmeyer [/bib_ref]. For open paediatric inguinal hernia repair (excluding premature babies), hernia recurrence was higher in the general surgery group compared with paediatric surgeons; in addition, only among paediatrics surgeons-having a higher surgical volumewas the estimated risk of hernia recurrence independent of surgical volume [bib_ref] Effect of subspecialty training and volume on outcome after pediatric inguinal hernia..., Borenstein [/bib_ref]. On the other hand, the results of nonexpert surgeons and even supervised residents using the Lichtenstein repair for primary inguinal hernias showed comparable excellent results to those of the experts [bib_ref] Surgical training and inguinal hernia repair, Rozon [/bib_ref] [bib_ref] A survey of non-expert surgeons using the open tension-free mesh patch repair..., Shulman [/bib_ref].
All surgeons graduating as general surgeons should have a profound knowledge of the anterior and posterior preperitoneal anatomy of the inguinal region. As long as they also treat recurrent hernias, it is logical to be adequately trained in both the anterior and posterior approach to the groin by means of adequately tested (pre)clinical training models and curricula [bib_ref] Improving operative performance using a laparoscopic hernia simulator, Hamilton [/bib_ref]. Most authors agree that the two major techniques to be taught early during surgical residency are the Lichtenstein technique for the anterior approach and the endoscopic techniques for the posterior approach. All new procedures should be compared to these techniques. In order to decrease patient exposure to learning curve errors during inguinal hernia repair and due to the current lack of realistic hands-on simulation models, at least 30-50 of each procedure should be performed during residency, with adequate mentoring by a motivated expert surgeon (and instructor!), provided the resident already has experience with endoscopic cholecystectomy (*endoscopic experience) [bib_ref] Laparoscopic herniorrhaphy: beyond the learning curve, Deturris [/bib_ref] [bib_ref] Laparoscopic hernia repair: the learning curve, Edwards Cc 2nd [/bib_ref] [bib_ref] The learning curve for totally extraperitoneal laparoscopic inguinal hernia repair, Liem [/bib_ref] [bib_ref] The learning curve in laparoscopic inguinal hernia repair for the community general..., Voitk [/bib_ref].
Every surgical resident graduating in the USA in 1999 performed during the whole residency period seven endoscopic/endoscopic and 50 open procedures, on average [bib_ref] Laparoscopic herniorrhaphy: beyond the learning curve, Deturris [/bib_ref]. Currently, a resident should ideally have performed at least ten complete endoscopic/endoscopic and 50 open inguinal hernia repairs independently [bib_ref] Statistical assessment of the learning curves of health technologies, Ramsay [/bib_ref]. In addition, a specific effort for postgraduate training in endoscopic inguinal hernia repair should be made for inexperienced consultant surgeons.

## Anaesthesia

## Authors: par nordin and sam smedberg
Can an open inguinal hernia operation under local anaesthesia be performed with the same patient satisfaction? Is this safer and more cost-effective than other anaesthesia techniques? Should regional anaesthesia be avoided?
Search terms: herniorrhaphy, groin hernia, local anaesthesia.

# Conclusions

## Level 1b
Open anterior inguinal hernia techniques can be satisfactorily performed under local anaesthetic. Regional anaesthesia, especially when using high-dose and/or long-acting agents, has no documented benefits in open inguinal hernia repair and increases the risk of urinary retention.

## Recommendations
Grade A It is recommended that, in the case of an open repair, local anaesthetic is considered for all adult patients with a primary reducible unilateral inguinal hernia.

## Grade b
Use of spinal anaesthesia, especially using highdose and/or long-acting anaesthetic agents, should be avoided. General anaesthesia with short-acting agents and combined with local infiltration anaesthesia may be a valid alternative to local anaesthesia.
Ideally, inguinal hernia repair should be performed using a simple and safe anaesthetic technique that is acceptable for the patient and easily mastered in general surgical practice. The technique should carry a low morbidity risk and also be cost-effective. Postoperative side effects and prolonged hospital stay after groin hernia surgery are often related to the effects of anaesthesia.
General anaesthesia can provide the surgeon with optimal operating conditions in terms of patient immobility and muscular relaxation. Modern general anaesthesia with short-acting agents and combined with local infiltration anaesthesia is safe and fully compatible with day-case surgery [bib_ref] Recovery profiles and costs of anesthesia for outpatient unilateral inguinal herniorrhaphy, Song [/bib_ref]. Disadvantages are risk for airway complications, cardiovascular instability, nausea and vomiting. Furthermore, urinary complications and recovery from central hypnotic effects may prolong the hospital stay.
Regional anaesthesia for groin hernia repair can be provided by either subarachnoid (spinal), epidural techniques or, more uncommonly, paravertebral techniques [bib_ref] Paravertebral somatic nerve block compared with peripheral nerve blocks for outpatient inguinal..., Klein [/bib_ref]. Spinal anaesthesia regularly results in urine retention, which results in prolonged postoperative recovery [bib_ref] Elimination of urinary retention following inguinal herniorrhaphy, Finley [/bib_ref] [bib_ref] Local, regional, or general anaesthesia in groin hernia repair: multicentre randomised trial, Nordin [/bib_ref] [bib_ref] Outpatient inguinal herniorrhaphy with both regional and local anesthesia, Ryan [/bib_ref] [bib_ref] Inguinal herniorrhaphy under local anaesthesia and spinal anaesthesia-a comparative study, Sultana [/bib_ref].
In recent years, improvements of the regional anaesthetic techniques have been made with the use of more short-acting local anaesthetic agents. Also, the use of additional spinal opioids combined with a reduction in the amount of spinal doses may reduce the postoperative side effects.
The open treatment of primary reducible inguinal hernias in adults is nearly always possible under local anaesthesia [bib_ref] One-thousand consecutive inguinal hernia repairs under unmonitored local anesthesia, Callesen [/bib_ref] [bib_ref] Three thousand one hundred seventy-five primary inguinal hernia repairs: advantages of ambulatory..., Kark [/bib_ref] [bib_ref] Anaesthetic practice for groin hernia repair-a nation-wide study in Denmark, Kehlet [/bib_ref] and can be provided by a local infiltration technique [bib_ref] Local anesthesia for inguinal hernia repair step-by-step procedure, Amid [/bib_ref] [bib_ref] Open ''tensionfree'' repair of inguinal hernias: the Lichtenstein technique, Amid [/bib_ref] or by a specific blockade of the ilioinguinal and iliohypogastric nerves or a combination of the two methods (see Appendix 4). The administration is technically quite easy but it requires training and is only successful if the surgeon handles the tissues gently, has patience and is fully conversant with the technique [bib_ref] Hernias of the abdominal wall. WB Saunders, Philadelphia 242, Ponka [/bib_ref]. Intraoperative pain seems to be the most common reason for dissatisfaction with local anaesthesia [bib_ref] Type of anaesthesia and patient acceptance in groin hernia repair: a multicentre..., Nordin [/bib_ref] [bib_ref] A randomised controlled trial to compare local with general anaesthesia for short-stay..., Teasdale [/bib_ref]. Some patients may prove to be unsuitable for local anaesthesia, notably very young patients, anxious patients, the morbidly obese and patients with suspected incarceration or strangulation. Whether scrotal hernias and obese patients are suitable depends entirely upon the surgeon's familiarity with the technique [bib_ref] Hernias of the abdominal wall. WB Saunders, Philadelphia 242, Ponka [/bib_ref].
Fourteen randomised studies comparing local anaesthesia with general and/or regional anaesthesia [bib_ref] A randomised controlled trial to compare local with general anaesthesia for inguinal..., Alsarrage [/bib_ref] [bib_ref] A comparison of general versus local anesthesia during inguinal herniorrhaphy, Behnia [/bib_ref] [bib_ref] A prospective randomized study on inguinal hernia repair according to the Shouldice..., Friemert [/bib_ref] [bib_ref] Ventilatory capacity after three methods of anaesthesia for inguinal hernia repair: a..., Godfrey [/bib_ref] [bib_ref] Comparison of local and general anesthesia in tension-free (Lichtenstein) hernioplasty: a prospective..., Gonullu [/bib_ref] [bib_ref] A prospective comparison of local and spinal anesthesia for inguinal hernia repair, Gultekin [/bib_ref] [bib_ref] Clinical evalation of the the of local anesthesia for repair of inguinal..., Knapp [/bib_ref] [bib_ref] Local, regional, or general anaesthesia in groin hernia repair: multicentre randomised trial, Nordin [/bib_ref] [bib_ref] Local or general anesthesia for open hernia repair: a randomized trial, O&apos;dwyer [/bib_ref] [bib_ref] Comparison of local, spinal, and general anaesthesia for inguinal herniorrhaphy, Ozgun [/bib_ref] [bib_ref] Extraperitoneal, ''tension free'' inguinal hernia repair with local anesthesia-a contribution to effectiveness..., Schmitz [/bib_ref] [bib_ref] Recovery profiles and costs of anesthesia for outpatient unilateral inguinal herniorrhaphy, Song [/bib_ref] [bib_ref] A randomised controlled trial to compare local with general anaesthesia for short-stay..., Teasdale [/bib_ref] [bib_ref] Spinal or local anesthesia in lichtenstein hernia repair: a randomized controlled trial, Van Veen [/bib_ref] and one comparing general with regional anaesthesia [bib_ref] Comparison of spinal vs general anesthesia via laryngeal mask airway in inguinal..., Burney [/bib_ref] was found. One study did not reveal any difference [bib_ref] Local or general anesthesia for open hernia repair: a randomized trial, O&apos;dwyer [/bib_ref] , while the others bear witness to the advantages for local anaesthetic, such as less postoperative pain, less anaesthesia-related complaints, less micturition difficulties, faster discharge and faster short-term recovery.
Cost comparisons for the anaesthetic alternatives have given similar results [bib_ref] Cost analysis of inguinal hernia surgery in Denmark, Bay-Nielsen [/bib_ref] [bib_ref] The feasibility, safety and cost of infiltration anaesthesia for hernia repair. Hvidovre..., Callesen [/bib_ref] [bib_ref] Costing anaesthetic practice. An economic comparison of regional and general anaesthesia for..., Kendell [/bib_ref] [bib_ref] Costeffectiveness analysis of local, regional and general anaesthesia for inguinal hernia repair..., Nordin [/bib_ref] [bib_ref] Recovery profiles and costs of anesthesia for outpatient unilateral inguinal herniorrhaphy, Song [/bib_ref]. Local anaesthesia provides cost advantages over both regional and general anaesthesia, regarding both total intraoperative as well as postoperative costs. Of three RCTs [bib_ref] Costeffectiveness analysis of local, regional and general anaesthesia for inguinal hernia repair..., Nordin [/bib_ref] [bib_ref] Local or general anesthesia for open hernia repair: a randomized trial, O&apos;dwyer [/bib_ref] [bib_ref] Recovery profiles and costs of anesthesia for outpatient unilateral inguinal herniorrhaphy, Song [/bib_ref] , two found local to be cheaper than both general and spinal anaesthesia [bib_ref] Costeffectiveness analysis of local, regional and general anaesthesia for inguinal hernia repair..., Nordin [/bib_ref] [bib_ref] Recovery profiles and costs of anesthesia for outpatient unilateral inguinal herniorrhaphy, Song [/bib_ref] , while one observed no major difference between local and general anaesthesia [bib_ref] Local or general anesthesia for open hernia repair: a randomized trial, O&apos;dwyer [/bib_ref].
Local anaesthesia carries a lower mortality risk in both elective and emergency operations [bib_ref] Mortality after groin hernia surgery, Nilsson [/bib_ref].

## Postoperative recovery

## Authors: rene fortelny and maciej smietanski
Which technique gives the fastest postoperative recovery?
Search terms: inguinal hernia, treatment, recovery, pain, outcome.

# Conclusions

## Level 1a
Endoscopic inguinal hernia techniques result in an earlier return to normal activities or work than the Lichtenstein technique.

## Recommendations
Grade A It is recommended that an endoscopic technique is considered if a quick postoperative recovery is particularly important.
Postoperative recovery is defined as a return to normal activities of daily living and the resumption of paid work.
The most important economic short-term effect after inguinal hernia surgery is the recommended postoperative recovery time, which was formerly 6 weeks on average [bib_ref] Postoperative course after inguinal herniorrhaphy. A case-controlled comparison of patients receiving workers'..., Salcedo-Wasicek [/bib_ref] [bib_ref] Bilateral exploration in inguinal hernia in juvenile patients, Sparkman [/bib_ref]. This figure originates from the period in which almost every surgeon treated inguinal hernia by means of an anterior approach without using mesh [bib_ref] When to return to work following a routine inguinal hernia repair: are..., Baker [/bib_ref]. The duration of convalescence varies considerably, basically due to the variation in recommendations and on the level of the patients' preoperative activity [bib_ref] Inguinal hernia repair: anaesthesia, pain and convalescence, Callesen [/bib_ref]. The resumption of work relies on different factors and is not only dependant on the operation technique [bib_ref] Dispositional pessimism predicts delayed return to normal activities after inguinal hernia operation, Bowley [/bib_ref] [bib_ref] Patient acceptance of outpatient treatment for inguinal hernia in Jos, Nigeria, Ramyil [/bib_ref] [bib_ref] Return to work after inguinal hernia repair, Rider [/bib_ref]. The main cause of prolonged recovery is predominantly pain [bib_ref] Inguinal hernia repair: anaesthesia, pain and convalescence, Callesen [/bib_ref]. In addition, co-morbidity and cultural background affect the time of recovery [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref]. An early resumption of daily activities and work has been advocated in all published recommendations but has not generally been adopted [bib_ref] Meralgia paresthetica: a complication of laparoscopic herniorrhaphy, Eubanks [/bib_ref]. Based on these widely accepted facts, the patients should be informed that they can immediately return to all of their usual activities of daily life if pain permits [bib_ref] Inguinal hernia repair: anaesthesia, pain and convalescence, Callesen [/bib_ref] [bib_ref] Meralgia paresthetica: a complication of laparoscopic herniorrhaphy, Eubanks [/bib_ref].
All tension-free hernia operation techniques (open, e.g. Lichtenstein procedure and plug and patch repair, or endoscopic approach, e.g. TAPP and TEP) have been analysed in various trials and result in a quicker postoperative recovery [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Tension-free inguinal hernia repair: TEP versus mesh-plug versus Lichtenstein: a prospective randomized..., Bringman [/bib_ref] [bib_ref] Inguinal hernia repair: anaesthesia, pain and convalescence, Callesen [/bib_ref] [bib_ref] Meta-analyses of randomized controlled trials of laparoscopic vs conventional inguinal hernia repairs, Chung [/bib_ref] [bib_ref] A cost and outcome comparison between laparoscopic and Lichtenstein hernia operations in..., Heikkinen [/bib_ref] [bib_ref] Return to work after inguinal hernia repair, Jones [/bib_ref] [bib_ref] Open or endoscopic total extraperitoneal inguinal hernia repair? A systematic review, Kuhry [/bib_ref] [bib_ref] Day-case endoscopic totally extraperitoneal inguinal hernioplasty versus open Lichtenstein hernioplasty for unilateral..., Lau [/bib_ref] [bib_ref] Local antibiotic prophylaxis in inguinal hernia repair, Lazorthes [/bib_ref] [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref] [bib_ref] Laparoscopic surgery for inguinal hernia repair: systematic review of effectiveness and economic..., Mccormack [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref] [bib_ref] Analysis of the SAGES Outcomes Initiative groin hernia database, Velanovich [/bib_ref].
The meta-analyses revealed that, after an open mesh procedure, patients recovered four days earlier on average than after a conventional repair, and recovered seven days earlier on average following an endoscopic operation than after an open technique with mesh [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Tension-free inguinal hernia repair: TEP versus mesh-plug versus Lichtenstein: a prospective randomized..., Bringman [/bib_ref] [bib_ref] Meta-analyses of randomized controlled trials of laparoscopic vs conventional inguinal hernia repairs, Chung [/bib_ref] [bib_ref] Laparoscopic versus open groin hernia repair: meta-analysis of randomised trials based on..., Grant [/bib_ref] [bib_ref] A cost and outcome comparison between laparoscopic and Lichtenstein hernia operations in..., Heikkinen [/bib_ref] [bib_ref] Open or endoscopic total extraperitoneal inguinal hernia repair? A systematic review, Kuhry [/bib_ref] [bib_ref] Day-case endoscopic totally extraperitoneal inguinal hernioplasty versus open Lichtenstein hernioplasty for unilateral..., Lau [/bib_ref] [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref] [bib_ref] Laparoscopic surgery for inguinal hernia repair: systematic review of effectiveness and economic..., Mccormack [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref] [bib_ref] Open mesh versus non-mesh for repair of femoral and inguinal hernia, Scott [/bib_ref]. The recovery was mostly measured using (non)-validated questionnaires or by enquiring about an end point (only the resumption of normal activities and/or paid work): so-called ADL questionnaires or a generic quality of life questionnaire (SF-36 or EuroQol) [bib_ref] Cost-effectiveness of extraperitoneal laparoscopic inguinal hernia repair: a randomized comparison with conventional..., Liem [/bib_ref] [bib_ref] A randomized comparison of physical performance following laparoscopic and open inguinal hernia..., Liem [/bib_ref] [bib_ref] Randomised controlled trial of laparoscopic versus open mesh repair for inguinal hernia:..., Wellwood [/bib_ref].
The results of these quality of life studies demonstrate that the recovery of hernia patients is not only restricted to the dimension of pain. It seems obvious that favourable physical outcomes facilitate the return to normal social life and productivity [bib_ref] Laparoscopic surgery for inguinal hernia repair: systematic review of effectiveness and economic..., Mccormack [/bib_ref]. Although the social and psychological impairment has already been observed in hernia patients, these aspects of recovery have, so far, been neglected by the surgical research in the field.
However, the growing body of literature underlines the importance of quality of life assessment in future studies on hernia repair.
In a number of studies, this quicker postoperative recovery was objectively confirmed by abdominal muscle exercises being carried out [bib_ref] Bassini repair compared with laparoscopic repair for primary inguinal hernia: a randomised..., Dirksen [/bib_ref] [bib_ref] A randomized comparison of physical performance following laparoscopic and open inguinal hernia..., Liem [/bib_ref] [bib_ref] Laparoscopic or open inguinal herniorrhaphy? A randomized prospective trial, Payne [/bib_ref].

## Aftercare

## Author: maarten simons
Is a lifting, sports or work ban indicated following inguinal hernia surgery?
Search terms: groin hernia, herniorrhaphy, aftercare, postoperative regime, postoperative recommendations, guidelines.

# Conclusions

## Level 3
The imposition of a temporary ban on lifting, participating in sports or working after inguinal hernia surgery, is not necessary. Probably a limitation on heavy weight lifting for 2-3 weeks is enough.

## Recommendations
Grade C It is recommended that limitations are not placed on patients following an inguinal hernia operation and patients are, therefore, free to resume activities. ''Do what you feel you can do.'' Probably a limitation on heavy weight lifting for 2-3 weeks is enough.
In a single prospective trial, two postoperative regimes (after Bassini technique) were compared with each other using a recurrence within 1 year as an end point [bib_ref] Early return to work after repair of a unilateral inguinal hernia, Taylor [/bib_ref]. The resumption of heavy work after 3 weeks was compared with that after about 10 weeks and has no influence on the recurrence rate.
If (after Lichtenstein technique under local anaesthetic) postoperatively patients were allowed to do what they could, and only excessive sport and heavy work were limited during the first 3 weeks, it resulted in [75% doing their own shopping without assistance within 6 days. Following light work, patients resumed work after an average of 6 days, and resumed heavy work 4 days after the proposed resting period was over [bib_ref] Short convalescence after inguinal herniorrhaphy with standardised recommendations: duration and reasons for..., Callesen [/bib_ref].
Recommendations about driving after an inguinal hernia operation differ considerably. A study showed that, after seven days, the normal response time was achieved in 82% of cases following an endoscopic repair, in 64% of cases after Lichtenstein operation and in 33% of cases after Bassini technique [bib_ref] A measurement of the ability to drive after different types of inguinal..., Wilson [/bib_ref]. In the Lichtenstein clinic, the opinion is that driving can be resumed straight away [bib_ref] Driving after repair of groin hernia, Amid [/bib_ref]. It is hardly surprising that every surgeon gives a different recommendation [bib_ref] Advice on driving after groin hernia surgery in the United Kingdom: questionnaire..., Ismail [/bib_ref].

## Postoperative pain control

## Authors: par nordin and sam smedberg
What is the best method for realising an effective postoperative pain control?
Search terms: herniorrhaphy, local anaesthetic(s), groin hernia, local anaesthesia, local infiltration.

# Conclusions

## Level 1b
Wound infiltration with a local anaesthetic results in less postoperative pain following inguinal hernia surgery.

## Recommendations
Grade A Local infiltration of the wound after hernia repair provides extra pain control and limits the use of analgesics.
In addition to the medicinal postoperative analgesia, which is not discussed further, there are sufficient studies which demonstrate that wound infiltration with a local anaesthetic results in less postoperative pain than the administration of placebos [bib_ref] The effects of wound infiltration with bupivacaine versus saline on postoperative pain..., Dierking [/bib_ref] [bib_ref] Postoperative pain after inguinal herniorrhaphy with different types of anesthesia, Tverskoy [/bib_ref].
http://www.postoppain.org covers evidence-based recommendations.

## Complications

## Authors: sam smedberg and par nordin
How frequent are complications after inguinal hernia operations, and can the risk of complications be reduced?
Which are the specific complications following inguinal hernia operation and how should they be treated?
Search terms: inguinal hernia, clinical trial, randomised controlled trial and the terms associated with the complication.
The overall risk of complications after inguinal hernia operations reported vary from 15 to 28% in systematic reviews [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref]. With active monitoring such as phone calls, questionnaires or clinical examination, the rates have been reported to be higher, ranging from 17 to 50% [bib_ref] Short-term results of a randomized clinical trial comparing Lichtenstein open repair with..., Eklund [/bib_ref] [bib_ref] Open mesh versus laparoscopic mesh repair of inguinal hernia, Neumayer [/bib_ref] [bib_ref] Type of anaesthesia and patient acceptance in groin hernia repair: a multicentre..., Nordin [/bib_ref]. The most frequent early complications were haematomas and seromas (8-22%), urinary retention and early pain, and late complications were mainly persistent pain and recurrences [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref]. Lifethreatening complications were rarely reported [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref]. Risks of complications are related to several factors, as described below. Hernia surgery is reconstructive surgery and it appears that meticulous technique pays off, e.g. regarding nerve damage and recurrences, irrespective of what method of repair has been used (level 2). Differences in the results between methods will be described in more detail.
Which are the specific complications following inguinal hernia operation and how should they be treated?
Search terms: inguinal hernia, clinical trial, randomised controlled trial and the terms associated with the complication.
In this chapter, the literature on chronic pain and related conditions will be evaluated. For other complications, only recommendations will be stated due to the low level of evidence and for the sake of readability.
Inguinal hernia surgery has a relatively low risk of perioperative and early postoperative complications of some significance. A study of the literature, however, reveals a number of issues: -Results published by specialist centres (level 3-4) are much better than the results from everyday practice (level 1-3) -Open inguinal hernia surgery and endoscopic inguinal hernia surgery have specific technique-related complications -The definitions of complications vary between reports, which makes the evaluation of results difficult -Postoperative chronic pain is more frequent than previously understood, and has recently become one of the most important primary endpoints in hernia surgery -Serious peri-and postoperative complications in respect of visceral and vascular injuries are rare -The risk for serious complications appears to be lower for open repair compared with endoscopic techniques [bib_ref] Laparoscopic surgery for inguinal hernia repair: systematic review of effectiveness and economic..., Mccormack [/bib_ref] Haematoma Serious, transfusion-requiring haemorrhages rarely occur in the case of open and endoscopic inguinal hernia surgery. The incidence of inguinal haematomas is lower for the endoscopic techniques than with open repair.
In the case of open surgery, the risk of haematomas varies between 5.6 and 16%. When endoscopic techniques were used, the risk varies between 4.2 and 13.1% [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref] [bib_ref] Endoscopic inguinal hernia repair in comparison with Shouldice and Lichtenstein repair. A..., Schmedt [/bib_ref]. A small haematoma can be treated conservatively. For larger haematomas, which also give rise to a lot of pain and/or tension on the skin, an evacuation of the haematoma under anaesthetic should be considered. [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref].

# Results

## Seroma
The risk of seroma formation varies between 0.5 and 12.2%. These incidences are significantly higher for the endoscopic techniques than for open repairs [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref] [bib_ref] Endoscopic inguinal hernia repair in comparison with Shouldice and Lichtenstein repair. A..., Schmedt [/bib_ref]. Most seromas disappear spontaneously within a period of 6-8 weeks. Should a seroma persist, it can be aspirated. Infection following the aspiration of seromas is regularly described. Studies concerning postoperative drainage to prevent seromas are contradictory. In two RCTs of patients following open intervention, no advantage was observed in a series of 100 patients, whereas in another series of 301 patients, clear advantages were revealed for a drainage period of 24 h [bib_ref] A trial of suction drainage in inguinal hernia repair, Beacon [/bib_ref] [bib_ref] Value of subcutaneous drainage in repair of primary inguinal hernia. A prospective..., Peiper [/bib_ref]. The risk of seroma is rarely big enough to necessitate leaving a drain, except in the case of excessive diffuse blood loss or patients with (iatrogenic) coagulopathies.

## Results of the systematic review seroma after open mesh
versus open non-mesh in 13 trials: 38/1,548 (2.4%) versus 24/1,497 (1.6%); OR 1.52 (0.92-2.52) n.s. [bib_ref] Open mesh versus non-mesh repair of groin hernia: meta-analysis of randomised trials..., Grant [/bib_ref].
Seroma after endoscopic technique versus open technique in 28 trials: 139/2,408 (5.7%) versus 101/2,679 (3.7%); OR 1.58, 95% CI: (1.20-2.08) P = 0.001 [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref]. Grade C It is recommended that seromas are not aspirated.

## Wound infection
Open and endoscopic surgery. The risk of a wound infection following an inguinal hernia operation with or without mesh should be below 5%. The use of mesh in inguinal hernia repair is not associated with a higher risk of wound infection. Superficial infections are rare after endoscopic techniques. The risk is probably about 1-3% for open surgery and less than 1% after endoscopic surgery [bib_ref] Systematic review and meta-analysis of the effectiveness of antibiotic prophylaxis in prevention..., Aufenacker [/bib_ref] [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Laparoscopic techniques versus open techniques for inguinal hernia repair, Mccormack [/bib_ref] [bib_ref] Antibiotic prophylaxis for hernia repair, Sanchez-Manuel [/bib_ref] [bib_ref] Endoscopic inguinal hernia repair in comparison with Shouldice and Lichtenstein repair. A..., Schmedt [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref] [bib_ref] Chronic groin sepsis following tension-free inguinal hernioplasty, Taylor [/bib_ref]. [bib_ref] A prospective comparison of local and spinal anesthesia for inguinal hernia repair, Gultekin [/bib_ref].

# Results
Deep infections are rare and do not have to lead to the removal of the mesh when monofilament materials are used [bib_ref] Chronic groin sepsis following tension-free inguinal hernioplasty, Taylor [/bib_ref]. Drainage and antibiotics are usually sufficient. However, removal of the mesh has been described; this is virtually inevitable in the presence of a multifilament mesh.

## Urinary retention and bladder damage
The urinary retention incidence varies with a multiplicity of operative and peri-operative factors. In a review of the literature in the period 1966-2001 on urinary retention in relation to anaesthetic technique, 70 non-randomised and two randomised studies were found [bib_ref] Postherniorrhaphy urinary retention-effect of local, regional, and general anesthesia: a review, Jensen [/bib_ref]. The incidence of urinary retention with local anaesthesia was 0.37% (33 in 8,991 patients), with regional anaesthesia being 2.42% (150 in 6,191 patients) and with general anaesthesia being 3.00% (344 in 11,471 patients). The inhibitory effect of regional and general anaesthesia on bladder function would explain the results. In two metaanalyses of RCTs comparing endoscopic and open mesh or open non-mesh techniques, respectively, no significant differences in postoperative urinary retention were found [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref]. Preperitoneal placement of mesh with the TEP technique was found not to cause urinary retention by outflow obstruction or alteration of the bladder contractility [bib_ref] Urinary retention following endoscopic totally extraperitoneal inguinal hernioplasty, Lau [/bib_ref]. The volume of intravenous postoperative fluid administered is a significant risk factor [bib_ref] Incidence and risk factors for urinary retention after endoscopic hernia repair, Koch [/bib_ref].
Bladder damage can occur after both endoscopic and open surgery. It is an uncommon complication that is somewhat more frequent in transabdominal endoscopic operations. In the endoscopic literature, it varies from 4.2% in smaller series to 0.2% (8/3,868), 0.1% (1/686) and 0.06% [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref] [bib_ref] Surgical management of chronic pain after inguinal hernia repair, Aasvang [/bib_ref] [bib_ref] Incidence of complications following laparoscopic hernioplasty, Phillips [/bib_ref] [bib_ref] Totally extraperitoneal endoscopic inguinal hernia repair (TEP), Tamme [/bib_ref].
Predisposing factors are a full bladder, exposure of the retropubic space (particularly after prostate interventions, irradiation or TAPP) and the opening of the transversalis fascia/peritoneum in direct hernias (level 3).

## Recommendations

## Grade d
It is recommended that the patient empties his/ her bladder prior to endoscopic and open operations. It is recommended that the fascia transversalis/ peritoneum is opened with restrictivity in open surgery of direct hernias. Take care that the bladder might be herniated.

## Ischaemic orchitis, testicular atrophy and damage to the ductus deferens
Testicular complications occur after both open and endoscopic hernia surgery. No significant difference in incidence between open and endoscopic techniques were found in two meta-analyses of RCTs of high quality, the total number of cases being 51/7,622 (0.7%) [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref].
Postoperative ischaemic orchitis usually develops within 24-72 h after the operation. It may result in testicular necrosis within days or have a slower course, resulting in testicular atrophy over a period of several months. Acute ischaemia can be prevented by leaving the cremasteric vessels intact [bib_ref] Testicular atrophy as a consequence of inguinal hernia repair, Reid [/bib_ref]. There is an increased risk of ischaemic orchitis after recurrent open hernia surgery and after dissection below the level of the pubic tubercle, e.g. after complete excision of scrotal hernias [bib_ref] Testicular atrophy and chronic residual neuralgia as risks of inguinal hernioplasty, Wantz [/bib_ref]. Minimising cord dissection is recommended. Extensive dissection of the pampiniform plexus or tight closure of the internal ring may result in damage to the testicular vessels and/or ductus deferens [bib_ref] Fibrin sealant versus mechanical stapling for mesh fixation during endoscopic extraperitoneal inguinal..., Lau [/bib_ref]. Transection of the hernia sac leaving the distal part in situ is recommended to reduce the risk of ischaemic orchitis. Thrombosis of testicular veins following extensive dissection is considered to be the cause of ischaemic orchitis [bib_ref] Testicular atrophy and chronic residual neuralgia as risks of inguinal hernioplasty, Wantz [/bib_ref].

## Recommendations

## Grade d
It is recommended that, in the case of large hernia sacs, transection of the hernia sac is performed and the distal hernia sac is left undisturbed, so as to prevent ischaemic orchitis. Damage to the spermatic cord structures should be avoided.

## Damage to the intestines
Damage to the intestines rarely occurs in open hernia surgery and is, in general related, to an intervention for incarcerated hernia. In endoscopic hernia surgery, the risk is low; however, it occurs more frequently, from 0.0 to 0.21% [bib_ref] Laparoscopic hernioplasty: significant complications, Felix [/bib_ref] [bib_ref] Laparoscopic inguinal herniorrhaphy. Results of a multicenter trial, Fitzgibbons [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref] [bib_ref] Totally extraperitoneal endoscopic inguinal hernia repair (TEP), Tamme [/bib_ref]. Risk factors are previous major lower (open) abdominal interventions, previous radiotherapy of pelvic organs and insufficient insulation of endoscopic instruments during coagulation.

## Recommendations
Grade D It is recommended that patients with previous major lower (open) abdominal intervention or previous radiotherapy of pelvic organs do not undergo endoscopic inguinal hernia surgery.

## Bowel obstruction
The incidence of intestinal obstruction after TAPP inguinal hernia operation varies from 0.07 to 0.4% [bib_ref] Bassini repair compared with laparoscopic repair for primary inguinal hernia: a randomised..., Dirksen [/bib_ref] [bib_ref] Laparoscopic inguinal herniorrhaphy. Results of a multicenter trial, Fitzgibbons [/bib_ref] [bib_ref] Incidence of complications following laparoscopic hernioplasty, Phillips [/bib_ref] [bib_ref] Laparoscopic herniorrhaphy: technical concerns in prevention of complications and early recurrence, Tucker [/bib_ref]. It may also develop after TEP operation; however, this occurs less frequently [bib_ref] Totally extraperitoneal endoscopic inguinal hernia repair (TEP), Tamme [/bib_ref].
Bowel obstruction can develop due to adhesions between the mesh and the intestines [bib_ref] Inguinal herniorrhaphy: complications and recurrences, Macfadyen [/bib_ref] [bib_ref] Complications of laparoscopic herniorrhaphy, Macfadyen [/bib_ref] , e.g. by inadequate closure of a peritoneal lesion [bib_ref] Totally extraperitoneal endoscopic inguinal hernia repair (TEP), Tamme [/bib_ref]. Rare cases of bowel obstruction in port-site hernias have also been described, especially after TAPP.

## Recommendations
Grade D It is recommended that, due to the risk of intestinal adhesion and the risk of bowel obstruction, the extraperitoneal approach (TEP) is used for endoscopic inguinal hernia operations. It is recommended that trocar openings of 10 mm or larger are closed.

## Vessel damage
Damage to the large vessels rarely occur in the case of an open inguinal hernia operation, and is mostly described in the McVay technique [bib_ref] Cooper ligament repair: an update, Barbier [/bib_ref]. Damage to the epigastric vessels may occur more frequently, the significance of which, however, is obscure, since dividing the epigastric vessels is part of the original method in open preperitoneal techniques such as the Stoppa operation and its unilateral variety [bib_ref] The use of Dacron in the repair of hernias of the groin, Stoppa [/bib_ref] [bib_ref] Giant prosthetic reinforcement of the visceral sac, Wantz [/bib_ref].
In TAPP, blind introduction of the Veress needle and trocars may damage the aorta, vena cava and iliac vessels. The incidence is low and only occasional cases are reported in the hernia literature. In a large series, an incidence of 0.06-0.13% is reported [bib_ref] Transabdominal pre-peritoneal (TAPP) versus totally extraperitoneal (TEP) laparoscopic techniques for inguinal hernia..., Mccormack [/bib_ref] [bib_ref] Incidence of complications following laparoscopic hernioplasty, Phillips [/bib_ref]. Damage to the inferior epigastric vessels as a consequence of trocar introduction has an incidence of 0-0.07% [bib_ref] Laparoscopic hernioplasty: significant complications, Felix [/bib_ref] [bib_ref] Endoscopic totally extraperitoneal repair of bilateral inguinal hernias, Knook [/bib_ref] [bib_ref] Endoscopic total extraperitoneal repair of primary and recurrent inguinal hernias, Knook [/bib_ref] [bib_ref] Laparoscopic repair of recurrent inguinal hernias after endoscopic herniorrhaphy, Knook [/bib_ref].

## Recommendations

## Grade d
It is recommended that the first trocar at endoscopic hernia surgery (TAPP) is introduced by the open technique.

## Mesh rejection and migration
Mesh migration is described after all varieties of mesh repairs but for plug techniques in particular [bib_ref] Complications associated with the plugand-patch method of inguinal herniorrhaphy, Leblanc [/bib_ref]. Migration to the intestines, urinary bladder, femoral vein, preperitoneal space and the scrotum have been reported [bib_ref] Mesh migration following repair of inguinal hernia: a case report and review..., Agrawal [/bib_ref] [bib_ref] Mesh migration into the bladder after TEP repair: a rare case report, Chowbey [/bib_ref] [bib_ref] Small bowel obstruction resulting from mesh plug migration after open inguinal hernia..., Chuback [/bib_ref] [bib_ref] Sigmoid perforation, an exceptional late complication of peritoneal prosthesis for treatment of..., Hamy [/bib_ref] [bib_ref] Complications associated with the plugand-patch method of inguinal herniorrhaphy, Leblanc [/bib_ref] [bib_ref] Migrating mesh mimicking colonic malignancy, Ojo [/bib_ref]. Mesh rejection following different surgical techniques and mesh materials have also been reported [bib_ref] Prosthetic repair of inguinal and crural hernias, Balducci [/bib_ref] [bib_ref] Late rejection of the mesh after laparoscopic hernia repair, Foschi [/bib_ref] [bib_ref] Late mesh rejection as a complication to transabdominal preperitoneal laparoscopic hernia repair, Hofbauer [/bib_ref] [bib_ref] ) 1,000 prosthetic hernia repairs: experience of a dedicated team, Negro [/bib_ref] [bib_ref] Open tension free repair of inguinal hernias; the Lichtenstein technique, Sakorafas [/bib_ref] [bib_ref] Laparoscopic surgery of inguinal hernia by transperitoneal implantation of an artificial mesh...., Sandbichler [/bib_ref]. In a review of the literature on mesh plug migration, it was concluded that plug migration after open inguinal hernia surgery can be avoided if proper attention to detail is used at the time of initial repair [bib_ref] Migration after open mesh plug inguinal hernioplasty: a review of the literature, Jeans [/bib_ref].

## Specific endoscopic complications
Pneumatic complications. Pneumomediastinum, pneumothorax and subcutaneous emphysema (pneumoscrotum) are rarely reported and are mostly related to a high insufflation pressure [bib_ref] Pneumomediastinum, pneumothorax and subcutaneous emphysema complicating MIS herniorrhaphy, Browne [/bib_ref] [bib_ref] Pneumothorax as a complication of laparoscopic inguinal hernia repair, Ferzli [/bib_ref] [bib_ref] Pneumomediastinum as a complication of extraperitoneal laparoscopic inguinal hernia repair, Ramia [/bib_ref]. Subcutaneous CO 2 emphysema can occur due to the incorrect placing of the Veress needle or leakage of CO 2 along the trocars [bib_ref] Subcutaneous emphysema, pneumomediastinum, bilateral pneumothorax and pneumopericardium after laparoscopy, Pascual [/bib_ref].
Carbon dioxide insufflation-related complications. CO 2 insufflation can result in hypercapnia, acidosis and hemodynamic changes [bib_ref] The impact of pneumoperitoneum, pneumoretroperitoneum, and gasless laparoscopy on the systemic and..., Chiu [/bib_ref]. Hypercapnia was reported in 2/686 patients [bib_ref] Laparoscopic inguinal herniorrhaphy. Results of a multicenter trial, Fitzgibbons [/bib_ref].
Trocar complications. Trocar hernias vary from 0.06 to 0.4% for the TAPP to 0.7% for various endoscopic interventions [bib_ref] Laparoscopic hernioplasty: significant complications, Felix [/bib_ref] [bib_ref] Laparoscopic inguinal herniorrhaphy. Results of a multicenter trial, Fitzgibbons [/bib_ref] [bib_ref] Incidence of complications following laparoscopic hernioplasty, Phillips [/bib_ref]. Chronic pain, nerve damage and neuralgia
Definition: by the International Association for the Study of Pain (IASP), chronic pain is defined as pain lasting for 3 months or more [bib_ref] Classification of chronic pain. Descriptions of chronic pain syndromes and definitions of..., Aasvang [/bib_ref]. What causes chronic pain after inguinal hernia surgery, can it be prevented and how can it be treated?

## Conclusions; causes and risk factors
Level 1B
The risk of chronic pain after hernia repair with mesh is less than after non-mesh repair. The risk of chronic pain after endoscopic hernia repair is lower than after open hernia repair.

## Level 2a
The overall incidence of moderate to severe chronic pain after hernia surgery is around 10-12%. The risk of chronic pain after hernia surgery decreases with age.

## Level 2b
Preoperative pain may increase the risk of developing chronic pain after hernia surgery. Preoperative chronic pain conditions correlate with the development of chronic pain after hernia surgery. Severe early postoperative pain after hernia surgery is correlated to the development of chronic pain. Females have an increased risk of developing chronic pain after hernia surgery.

## Conclusions; prevention of chronic pain

## Conclusions; treatment of chronic pain

## Level 3
A multidisciplinary approach at a pain clinic is an option for the treatment of chronic postherniorrhaphy pain. Surgical treatment of specific causes of chronic post-herniorrhaphy pain can be beneficial for the patient, such as the resection of entrapped nerves, mesh removal in mesh-related pain, removal of endoscopic staples or fixating sutures.

## Grade a
The use of lightweight/material-reduced/largepore ([1000-lm) meshes inopen inguinal hernia repair can be considered to decrease longtermdiscomfort (when only considering chronic pain). Endoscopic surgery is superior to open mesh (when only consideringchronic pain), if a dedicated team is available.

## Grade b
It is recommended that risks of the development of chronic postoperative pain are taken into account when the method of hernia repair is decided upon. It is recommended that inguinal nerves at risk (three nerves) are identified at open hernia surgery.

## Grade c
It is recommended that a multidisciplinary approach is considered for the treatment of chronic pain after hernia repair. It is recommended that surgical treatment of chronic post-herniorrhaphy pain as a routine is restricted in the lack of scientific studies evaluating the outcome of different treatment modalities.

## Chronic pain after hernia operation, causes and risk factors
In a systematic review of the literature in the period 1987-2000, the frequency of chronic pain after hernia repair, reported in 40 studies, ranged from 0 to 53%. In six studies where pain was the primary outcome of interest, the frequency was highest, in the range . This observation was confirmed in a systematic review of the pain literature from 2000 through April 2004 [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref]. Overall, moderate to severe pain was experienced by 10-12% of the patients [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref].
Intraoperative nerve damage in relation to the development of chronic pain has been discussed [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref]. The risk of nerve damage is reduced at endoscopic surgery. The incidence of chronic pain is reported to be lower after TAPP and TEP compared to open surgery, with or without mesh [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref] [bib_ref] Surgical management of chronic pain after inguinal hernia repair, Aasvang [/bib_ref] [bib_ref] Chronic pain after hernia repair: a randomized trial comparing Shouldice, Lichtenstein and..., Koninger [/bib_ref] [bib_ref] Open mesh versus laparoscopic mesh repair of inguinal hernia, Neumayer [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref]. Other manifestations of nerve lesions like numbness and paresthesia are also fewer following endoscopic surgery [bib_ref] Comparison of endoscopic techniques vs Shouldice and other open nonmesh techniques for..., Bittner [/bib_ref] [bib_ref] Comparison of endoscopic procedures vs Lichtenstein and other open mesh techniques for..., Schmedt [/bib_ref]. A meta-analysis of 41 trials of endoscopic versus open groin hernia repair with 7,161 participants (individual patient data available for 4,165 cases) revealed less persisting pain and numbness after endoscopic repair [bib_ref] Laparoscopic versus open groin hernia repair: meta-analysis of randomised trials based on..., Grant [/bib_ref].
Patients undergoing reoperative surgery for recurrent hernia were at risk of developing chronic neuralgia with a four-fold higher rate of moderate or severe chronic pain [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref].
Most studies comparing mesh with non-mesh repair report less chronic pain with mesh repair [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref]. The EU Hernia Trialists Collaboration review concluded that significantly less pain followed mesh repairs in randomised studies of open flat mesh versus non-mesh, TAPP versus non-mesh and TEP versus non-mesh.
In an RCT comparing three open mesh techniques, long-term follow-up with a postal questionnaire including a VAS pain score was completed for 319 (95.8%) patients. Chronic pain was found to be related to younger age [bib_ref] Pain after anterior mesh hernia repair, Nienhuijs [/bib_ref] , which has also documented by others [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref] , and related to stronger pain directly after the operation [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref] [bib_ref] Pain after anterior mesh hernia repair, Nienhuijs [/bib_ref]. At 5-year follow-up of 867 patients (81.2%) in an RCT comparing TAPP and Shouldice inguinal hernia repair, no differences in late discomfort were found. However, severe pain during the first postoperative week was a risk factor for late discomfort in the Shouldice group (OR 2.25, P = 0.022) but not in the TAPP group [bib_ref] Discomfort five years after laparoscopic and Shouldice inguinal hernia repair: a randomised..., Berndsen [/bib_ref].
Preoperative pain may increase the risk of developing chronic pain according to some studies, and preoperative chronic pain conditions such as headache, back pain and irritable bowel syndrome have been found to be significantly correlated with the development of chronic pain [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref].
Females have been found to have an increased risk of developing postoperative chronic pain [bib_ref] Chronic postoperative pain: the case of inguinal herniorrhaphy, Aasvang [/bib_ref].

## Prevention of chronic pain
Attempting to reduce the risk of early postoperative pain and late chronic groin pain, the operative handling of inguinal nerves have been studied, methods of mesh fixation have been compared and meshes inducing less inflammatory reaction developed.
In a systematic review on nerve management during open hernia repair, three randomised studies were found reporting that chronic pain after identification and division of the ilioinguinal nerve was similar to that after identification and preservation of the nerve [bib_ref] Nerve management during open hernia repair, Wijsmuller [/bib_ref].
Two cohort studies suggested that the incidence of chronic pain was significantly lower after the identification of all inguinal nerves compared to without the identification of any nerves [bib_ref] Nerve management during open hernia repair, Wijsmuller [/bib_ref].
Fibrin glue and non-fixation techniques have been compared to mesh fixation with staples and tackers in endoscopic hernia operations. Reduced early postoperative pain with the non-stapling techniques were found, but there were no differences in the risks of late chronic pain in two studies [bib_ref] Fibrin sealant versus mechanical stapling for mesh fixation during endoscopic extraperitoneal inguinal..., Lau [/bib_ref] [bib_ref] Stapled and nonstapled laparoscopic transabdominal preperitoneal (TAPP) inguinal hernia repair. A prospective..., Smith [/bib_ref]. In one study, the risk of chronic pain at 1 year was lower with fibrin glue [bib_ref] Fibrin sealant versus mechanical stapling for mesh fixation during endoscopic extraperitoneal inguinal..., Lau [/bib_ref].
Lightweight mesh versus standard polypropylene mesh was studied in 590 patients operated with the Lichtenstein technique. At 3-year follow-up, there were no differences in neuralgic pain, hypoaesthesia or hyperaesthesia between the groups. There were no major differences in response to the pain questionnaire, except that fewer men with lightweight mesh had pain when rising from lying down to a sitting position. Significantly more men in the standard mesh group could feel the mesh in the groin, 22.6 versus 14.7%; P = 0.025 (v 2 test) [bib_ref] Three-year results of a randomized clinical trial of lightweight or standard polypropylene..., Bringman [/bib_ref].
Earlier randomised studies of 117 and 321 patients, respectively, indicated that the use of lightweight mesh was associated with significantly less pain during exercise after 6 months and less pain of any severity at 12 months in the lightweight group [bib_ref] Randomized clinical trial assessing impact of a lightweight or heavyweight mesh on..., O&apos;dwyer [/bib_ref] [bib_ref] Randomized clinical trial of lightweight composite mesh for Lichtenstein inguinal hernia repair, Post [/bib_ref].

## Treatment of chronic pain
There are no randomised studies on the treatment of chronic pain after hernia surgery. All studies analysed in a systematic review of the surgical management of chronic groin pain after inguinal hernia repair were found to suffer from poor methodological quality in different aspects [bib_ref] Surgical management of chronic pain after inguinal hernia repair, Aasvang [/bib_ref].
The recommendation that patients suffering from severe groin pain more than 3 months postoperatively should be referred to a pain clinic was based on observations in a nationwide follow-up study [bib_ref] Outcome of patients with severe chronic pain following repair of groin hernia, Courtney [/bib_ref]. Patients with severe groin pain often had a history of a pain syndrome, and 71% of patients with severe groin pain 3 months postoperatively still had pain after 2.5 years [bib_ref] Outcome of patients with severe chronic pain following repair of groin hernia, Courtney [/bib_ref].
Step by step diagnosis and treatment of chronic postoperative groin pain in a multidisciplinary treatment centre resulted in 16 cures and 22 improvements among 47 studied cases. Surgery was performed in selected cases not described in detail [bib_ref] Treatment of neuralgia after surgical repair of inguinal hernia. Apropos of 47..., Gatt [/bib_ref].
Resection of one or more inguinal nerves has been successful. Eighty percent of pain-free patients at 1 month in a series of 225 patients was reported [bib_ref] Causes, prevention, and surgical treatment of postherniorrhaphy neuropathic inguinodynia: triple neurectomy with..., Amid [/bib_ref]. Long-term follow-up and evaluation of neurectomy is, however, sparse.
In a series of 117 re-explorations because of pain after hernia surgery, 20 had a previous mesh repair. All 20 meshes were removed, 16 including neurectomy. There was a 60% success rate [bib_ref] Mesh inguinodynia: a new clinical syndrome after inguinal herniorrhaphy?, Heise [/bib_ref].

## Sexual complaints
Ejaculatory pain and sexual dysfunction related to inguinal hernia are evaluated in only a few studies, and prophylactic measures or treatments have, till now, not been suggested. Preoperative hernia-related sexual dysfunction in 11 patients (15% of a study group of 73) was successfully treated by the hernia operation in all cases [bib_ref] Inguinal hernia: obligatory indication for elective surgery? A prospective assessment of quality..., Zieren [/bib_ref]. In the same study group, postoperative sexual dysfunction appeared in ten patients and recovered spontaneously in six within 12 months.
In a Danish nationwide questionnaire study of pain related sexual dysfunction, executed in September 2004, all men aged 18-40 years undergoing inguinal herniorrhaphy, mainly open mesh repairs, between October 2002 and June 2003 (n = 1,015) were included, with a response rate of 63.4%. Genital or ejaculatory pain was found in 12.3% and 2.8% reported a moderate to severe impairment of sexual activity [bib_ref] Pain related sexual dysfunction after inguinal herniorrhaphy, Aasvang [/bib_ref]. These symptoms were assessed more in detail in ten patients and compared with 20 patients with postoperative chronic pain without sexual dysfunction [bib_ref] Ejaculatory pain: a specific postherniotomy pain syndrome?, Aasvang [/bib_ref]. The pain was specifically located at the external inguinal ring in ejaculatory pain patients, and psychosexual interview concluded that the pain was of somatic origin. The symptoms were related to deterioration in the overall quality of life and sexual function of the patients.

## Mortality
Mortality risk following elective inguinal hernia repair is low, even at older age. It is, in all series, less than 1% and in a Swedish register study not raised above that of the background population [bib_ref] Mortality after groin hernia surgery, Nilsson [/bib_ref]. In a Danish study among 26,304 patients, this was 0.02% under the age of 60 years and 0.48% above 60 years of age [bib_ref] Danish Hernia Database Collaboration (2001) Quality assessment of 26,304 herniorrhaphies in Denmark:..., Bay-Nielsen [/bib_ref].
An emergency operation carries a substantial mortality risk [bib_ref] Incarcerated groin hernias in adults: presentation and outcome, Alvarez [/bib_ref] [bib_ref] Danish Hernia Database Collaboration (2001) Quality assessment of 26,304 herniorrhaphies in Denmark:..., Bay-Nielsen [/bib_ref] [bib_ref] Emergency hernia repairs in elderly patients, Kulah [/bib_ref] [bib_ref] Presentation and outcome of incarcerated external hernias in adults, Kulah [/bib_ref] [bib_ref] Emergency repair of groin herniae: outcome and implications for elective surgery waiting..., Malek [/bib_ref] [bib_ref] Mortality after groin hernia surgery, Nilsson [/bib_ref] [bib_ref] Inguinal hernia repair: incidence of elective and emergency surgery, readmission and mortality, Primatesta [/bib_ref]. In the Danish study, the mortality was 7%, and in the Swedish database, it was increased seven-fold after emergency operations and 20fold if bowel resection was undertaken [bib_ref] Danish Hernia Database Collaboration (2001) Quality assessment of 26,304 herniorrhaphies in Denmark:..., Bay-Nielsen [/bib_ref] [bib_ref] Mortality after groin hernia surgery, Nilsson [/bib_ref].
Women have a higher mortality risk than men due to a greater risk for emergency procedure irrespective of hernia anatomy and a greater proportion of femoral hernia. After femoral hernia operation, the mortality risk was increased seven-fold for both men and women [bib_ref] Mortality after groin hernia surgery, Nilsson [/bib_ref].

## Recommendations

## Grade b
It is recommended to offer patients with femoral hernia early planned surgery, even if symptoms are vague or absent.
Grade D It is recommended to intensify efforts to improve the early diagnosis and treatment of patients with incarcerated and/or strangulated hernia.

## Costs

## Authors: timo heikkinen and marc miserez
What is the most cost-effective operation for the treatment of primary inguinal hernia?
Search terms: inguinal hernia, costs.

# Conclusions

## Level 1b
From the perspective of the hospital, an open mesh procedure is the most cost-effective operation in primary unilateral hernias. From a socioeconomic perspective, an endoscopic procedure is probably the most cost-effective approach for patients who participate in the labour market, especially for bilateral hernias. In cost-utility analyses including quality of life (QALYs), endoscopic techniques (TEP) may be preferable since they cause less numbness and chronic pain. [bib_ref] Laparoscopic surgery for inguinal hernia repair: systematic review of effectiveness and economic..., Mccormack [/bib_ref]. Fourteen studies on cost-effectiveness evaluation were reviewed until August 2003. TEP and TAPP were compared indirectly. A Markov model was used to perform the economic analysis. Hernia recurrence and return to work were the main outcome parameters. Also, numbness and persisting pain were included in the QALY analyses. It has been stated by others that a cost per QALY gained of $50,000 (= 37,000) is generally viewed as a reasonable cutoff for the public funding of a medical procedure.
Endoscopic hernia was estimated to be 450-675 more expensive to the health service per patient.
Unilateral hernia: in most cases, open mesh repair was the least costly option, but provided less QALYs compared to TEP or TAPP. TEP was likely to dominate TAPP.
Bilateral hernias: TEP was found to be the most costeffective in most cases, since the difference in operation times was not significant.
Recurrent hernias: the data was sparse and the results unreliable to make any conclusions on recurrent hernias. This might be a reflection of the current situation, where surgeons usually choose the endoscopic approach after open recurrence and vice versa. Thus, starting a study in this group might feel needless and ethically inappropriate.
Gholghesaei et al. [bib_ref] Costs and quality of life after endoscopic repair of inguinal hernia vs..., Gholghesaei [/bib_ref] performed a qualitative review of 18 prospective (R)CT explicitly involving cost-effectiveness and outcome measurements associated with costs (Medline and Cochrane Central Controlled Trials Registry) in the period 1994-2004 with similar findings concluded in the Health Technology Assessment.
A very recent paper compared in 66 patients the level of postoperative pain, the use of analgetics and return to work in a RCT comparing TAPP, TEP and Lichtenstein [bib_ref] The economic impact of laparoscopic inguinal hernia repair: results of a double-blinded,..., Butler [/bib_ref]. No differences were found, except a higher operative cost for the endoscopic groups.
For the cost price of synthetic mesh, it is generally true that prefabricated products are more expensive than simple flat prostheses that can be cut to the desired shape.
Two RCTs have suggested that mesh fixation is not necessary in endoscopic surgery, provided a large prosthesis with wide overlap is used. The only exception might be large direct hernias (and femoral hernias?), although the first group used an expensive self-expandable, threedimensional prosthesis [bib_ref] Randomized prospective study of totally extraperitoneal inguinal hernia repair: fixation versus no..., Koch [/bib_ref] [bib_ref] Randomized clinical trial of fixation vs nonfixation of mesh in total extraperitoneal..., Moreno-Egea [/bib_ref].
Taken together, the paper by McCormack et al. gives the best overview of the current evidence, with an overall advantage for endoscopic surgery (TEP) when productivity costs and quality of life are included in the analyses (level 1B, recommendation A) [bib_ref] Laparoscopic surgery for inguinal hernia repair: systematic review of effectiveness and economic..., Mccormack [/bib_ref]. Many estimations were done for primary unilateral hernia. However, data from individual trials and meta-analyses is mainly based on trials carried out in the 1990s, when the endoscopic technique was in the developing stages. For example, it has been concluded in all of the meta-analyses that endoscopic procedures take longer to perform. According to the Swedish Hernia Registry data from 2006, the mean operating times with Lichtenstein and TEP procedures were 56 min and 39 min, respectively. Thus, the conclusions should be interpreted with care since local expertise, the used instrumentation and its cost can vary significantly compared to the available data. More data for bilateral and recurrent hernias are necessary.
Ideally, the total cost for Lichtenstein repair in day surgery under local anaesthesia should be compared with TEP (or TAPP) (general anaesthesia) also in day surgery, both for unilateral and bilateral/recurrent hernias. The type of employment is probably also an important determinant of indirect costs. Of course, many decisions are driven by the local health care and insurance reimbursement systems, which makes it difficult to compare studies in different European countries.
Other means to reduce direct costs are the use of reusable instruments (vs. sterilisation costs) and a shorter learning curve period with longer operation times. Therefore, a structured training programme both for open and endoscopic hernia repair is likely to be very useful. Longterm data should be investigated more closely, since, for example, chronic pain can have a significant impact on patients' quality of life and cost-effectiveness, accordingly.
Questions for the future These guidelines provide an answer to many of the questions concerning the treatment of inguinal hernia. However, a large number of questions remain unanswered. Cleave fascia transversalis until in entirely healthy tissue or as far as is necessary to perform reconstruction. Reconstruction with continuous suturing using 2.0 or 3.0 polypropropylene; starting medially, not through periosteum of the pubic tubercle. Suture inferior edge of the fascia transversalis (Thomson's ligament) to a fold of the anterior side of the conjoined tendon ('white line') until the internal ring is constricted (allowing passage for the spermatic cord and point of tweezers). Return as a second layer after including cremaster stump with the same thread to the iliopubic tract (inferior edge of the inguinal ligament). Third layer begin laterally, closure of the conjoined tendon to inguinal ligament. Original Shouldice has a fourth layer in the same plane. Closure of the external oblique aponeurosis with soluble suture material without constriction of the external ring. Approximation of Scarpa's fascia. Closure of the skin.

## Lichtenstein
Incision sufficiently medially for good exposure of the tubercle of pubic bone and rectus sheath. Ligation of superficial veins. Cleave external oblique (preserve ilioinguinal nerve). Surround spermatic cord. Assess posterior wall. Cremaster does not need to be excised unless hypertrophic, thus, leaving an unacceptably wide internal ring. Dissect hernia sac until inside the internal ring, transect, resect or preferably reduce. If necessary, suture a large direct hernia tension-free with continuous soluble sutures until a flat posterior wall has been created with a normal internal ring. Preserve all nerves in principle, but cut without hesitation if damaged or interference with the placement of mesh. Pay particular attention to the iliohypogastric nerve; this may lie under the mesh, but preferably not against a sharp edge (cut prosthesis to the size it needs to be; dividing a nerve is better than causing neuralgic pain). Apply polypropylene mesh 7 9 14 cm (trimming is often necessary) with a 2-cm overlap at the pubic tubercle. Suture continuously with polypropylene sutures 3.0 starting 2 cm mediocranially from the pubic tubercule on the lateral rectus edge and then on the inguinal ligament to the internal ring. Make an incision in the mesh on 1/3 of the lower side until just medial to the spermatic cord. Suture both flaps of the prosthesis overlapping on the lateral side to the inguinal ligament with one polypropylene suture; upper flap over the lower flap. Fix cranial edge of the mesh with one or more sutures (may be soluble) to the aponeurosis of the internal oblique, avoiding muscle in order to avoid injury to the intramuscular segment of the iliohypogastric nerve. Take care not to entrap nerves by suturing! Mesh must lie tension-free (domed) after removal of the wound spreader. Close as in the Shouldice technique. In women, try to preserve the round ligament and the ilioinguinal nerve and handle in the same way as the spermatic cord. If both structures are cut, it is not necessary to create flaps in the mesh.

## Endoscopic (tep)
Anaesthetise. Bladder empty before the operation! Incision (2 cm) just under and next to the umbilicus until inside the anterior rectus sheath. Open preperitoneal space with the finger and, if needs be, insert balloon (optional) up to the pubic bone. Insufflation with gas under camera control. Replace balloon with blunt balloon or Hasson trocar, 10-15 mm Hg. Patient 20Trendelenburg. Identification of os pubis, Cooper's ligament, epigastric vessels and internal ring. Differentiate between direct hernia or indirect hernia. Dissect with second trocar (5 or 10 mm in medial line) lateral space until ASIS and insert third trocar (5 mm). Dissect lateral hernia sac from the spermatic cord and separate and put aside cord structures over 5-7 cm. (Via rendez-vous) insert 15 9 15 or 10 9 15 cm polypropylene prosthesis and drape over abdominal wall with plenty of overlap for all potential hernia defects. Be aware that mesh edges can curl up. Carefully desufflate and remove instruments while holding the peritoneal sac 'inside' the mesh. Close the fascial defects [10 mm. http://www.uzleuven.be/be/en/abdominal-surgery/ operative-procedures

# Introduction
This leaflet informs you about an inguinal hernia and the most usual treatment possibilities. It is worth noting that for each person the situation can be different from that described here.

## An inguinal hernia
A hernia is a protrusion of the abdominal content through a weak point or opening in the abdominal wall. The hernia is recognisable as a local swelling. The hernia defect is the opening or weakening in the abdominal wall. This can arise due to congenital factors or due to stretching of the abdominal wall. Stretching can occur during the course of life, for example due to increasing body weight, straining, coughing a lot or doing a lot of heavy lifting. It is possible that the protrusion of the abdominal content-the so-called hernia sac-contains part of the abdominal contents. If the pressure on the abdomen increases (such as when standing up, straining or coughing), more of the abdominal contents can come into the protrusion (= the hernia sac). The hernia then becomes bigger.
In an inguinal hernia the protrusion is in the inguinal (or groin) area.
An inguinal hernia never disappears spontaneously and can become larger. This can lead to more complaints. Sometimes a hernia can become trapped. Then the contents of the hernia, which are mostly suddenly increased, are trapped in the hernia defect. This is very painful. An emergency operation is then necessary.

## Diagnosis and examination
The surgeon establishes the diagnosis on the basis of the findings at the physical examination. Additional tests and examinations are not usually necessary. The surgeon can usually diagnose the hernia easily whilst you are standing up. If you are diagnosed as having a hernia, the surgeon will discuss with you how the hernia can best be treated in your case. In general an operation will be advised. A hernia truss is only prescribed very rarely nowadays.

## The operation
Depending on the circumstances, the operation can be carried out as day surgery or during a short hospital admission. The anaesthetist will discuss with you whether the operation will take place under a spinal, general or local anaesthetic.
There are various techniques to repair inguinal hernias. Two principle methods are used:
-Approaching the hernia from the front. In this the operation is performed via a cut close to the hernia. The protrusion of the abdominal wall is removed. If necessary the opening or weak point in the abdominal wall is repaired. During this the abdominal wall is strengthened, making use of the tissue from the abdominal wall itself (termed herniorrhaphy) or by stitching in a piece of synthetic material. This synthetic material is safe and is usually well-tolerated by the body. -Approaching the hernia from behind. In this method the hernia is treated from the inside of the abdominal wall. The protrusion (hernia sac) is removed and the opening or weak point in the abdominal wall is strengthened by means of a piece of synthetic material. The synthetic material is safe and is usually well-tolerated by the body. The operative approach of the hernia from the inside can be carried out by means of conventional or keyhole surgery techniques. In keyhole surgery the instruments and a camera are inserted via small holes in the abdomen. The camera is linked with a TV monitor. Via the camera the surgeon can see what he is doing on the TV screen.
These new methods are not suitable for every patient. For example, if the hernia cannot be pushed back then this method cannot be used.
The surgeon will discuss with you which method seems best in your case. An inguinal hernia operation usually takes 45 min to one hour to perform.

## Possible complications
No operation is free of risks. In these operations the normal risk of complications is also present, such as secondary bleeding, wound infections, thrombosis or pneumonia.
You can recognise a minor expression of a bleeding after several days in the form of a blue discolouration in the wound area, which can spread down into the base of the penis and scrotum in men or into the labium majora in women. This is not a reason for concern.
The result of the operation might seem to be good. Yet during the course of time a small number of patients who have been operated on can develop a hernia in the same place (a recurrent hernia). In such cases another operation is usually necessary.
As there are several nerves in the area operated on-in men also the spermatic cord-damage to these structures might occur. Fortunately, such complications rarely occur. A loss of feeling or sometimes a continuous pain around the operation area can occur as a result of damage to a nerve.

## After the operation
After the operation, the operation area will be painful. You can use painkillers such as paracetamol for the pain. You can buy these from a pharmacist or chemist beforehand so that you already have these painkillers at home prior to the operation.
Shortly after the operation it is often advisable to support the wound area with your hand, especially when the pressure increases (coughing, straining).
Depending on the operation method, the size of the operation and individual factors, you may experience inconvenience in the operation area for a while after you have been discharged. Also the resumption of your daily activities and the possibility of lifting things again will depend on this. The surgeon will provide you with some advice concerning this.

## Discharge
Upon discharge you will be given an appointment for an outpatients' check-up. The stitches can be removed after a week. This can be done by the general practitioner or during the outpatients' check-up. Sometimes use is made of soluble stitches, which do not need to be removed.

## Questions
If you still have questions, please direct these to the treating surgeon or your general practitioner.
In the case of urgent questions or problems prior to your treatment you can best contact the department where the treatment will take place. If problems occur at home after the operation, please contact your general practitioner or the hospital.

# Conclusion
If you are of the opinion that certain information is lacking or unclear, please could you be so kind as to inform us. Target population All patients with a primary or recurrent inguinal hernia (asymptomatic or symptomatic, acute or elective). The guidelines concern male patients unless stated otherwise.
Intended (target) users Surgeons and trainee surgeons. Some chapters are also intended for other care providers, such as general practitioners.
Initial 5. What is the best technique for treating an inguinal hernia, taking into account the type of hernia and the patient? 6. Following a non-mesh inguinal hernia operation, is the risk of recurrence lower for women than for men? Should women be treated with a different strategy? 7. Does a young man have a very low risk of recurrence following a non-mesh inguinal hernia operation due to an indirect hernia? Is mesh treatment indicated for this category of patients? 8. What mesh type is the most suitable in inguinal hernia repair, and what mesh-related complications can occur? 9. Can inguinal hernia surgery be performed in a day surgery setting? Is this safe and cost-effective? 10. Is antibiotic prophylaxis routinely indicated for elective inguinal surgery for primary inguinal hernia? 11. What is the learning curve and training in inguinal hernia repair?

## Can an open inguinal hernia operation under local
anaesthesia be performed with the same patient satisfaction? Is this safer and more cost-effective than other anaesthesia techniques? Should regional anaesthesia be avoided? 13. Which technique gives the fastest postoperative recovery? 14. Is a lifting, sports or work ban indicated following inguinal hernia surgery? 15. What is the best method for realising an effective postoperative pain control? 16. How frequent are complications after inguinal hernia operations, and can the risk of complications be reduced? Which are the specific complications following inguinal hernia operation and how should they be treated? 17. What is the most cost-effective operation for the treatment of primary inguinal hernia?

## Assessment of the guidelines
We assessed the guidelines by using the Appraisal of Guidelines for REsearch and Evaluation (AGREE) instrument, version September 2001. A previous version of the guidelines (August 2008) was assessed independently by two appraisers. Differences in scores were discussed to reach consensus. For scores lower than 4 ('strongly agree'), we explained the reasons for our response. Apart from the AGREE assessment, we had some other comments and suggestions to improve the quality of the guidelines.
We discussed our assessment and comments with the guidelines' authors. Many adjustments were made. The next version of the guidelines (February 2009) was reassessed with AGREE by one appraiser and discussed with the second appraiser.
We did not calculate standardised domain scores. Although the domain scores may be useful for comparing guidelines and will inform the decision as to whether or not to use or recommend a guideline, it is not possible to set thresholds to mark a 'good' or 'bad' guideline.
AGREE assessment Score: 1 = strongly disagree, 2 = disagree, 3 = agree, 4 = strongly agree [fig_ref] Table 1: Transparency of the process and methodThe Steering Committee first met in Torino... [/fig_ref] Item Score Scope and purpose The overall objective(s) of the guidelines is (are) specifically described
[formula] 4 2 [/formula]
The clinical question(s) covered by the guideline is (are) specifically described

## 3
The patients to whom the guideline is meant to apply are specifically described The criteria for selecting the evidence are clearly described ''For all articles, in accordance with evidence-based guidelines criteria, two surgeons always determined whether or not an article was relevant (according to possible bias). Each time a unanimous final opinion was sought and this was always realised. The Working Group met on 3 occasions. For chapters in which only level 2c or 3 articles were available it was difficult to choose best evidence from at times hundreds of articles. Search bias in these cases cannot be excluded''
Criteria and reasons for including and excluding studies are not mentioned (e.g. language or publication type restriction, exclusion of low quality studies)
''According to evidence based medicine guidelines quality was assessed''
The method of assessment of the quality of the studies is not clear (e.g. which methodological items were assessed) 1 [fig_ref] Table 1: Transparency of the process and methodThe Steering Committee first met in Torino... [/fig_ref] The methods used for formulating the recommendations are clearly described ''The concept chapters were discussed and (where necessary) consensus was found after which recommendations were agreed upon''
''After this a consensus (where necessary) was reached and the conclusions and recommendations were formulated''
The description of the methods used for formulating the recommendations is limited. For example, were other factors than evidence from the literature taken into consideration? If so, what were these other factors and how where they weighted against the scientific evidence?
The classification for diagnostic studies is not mentioned Evidence tables are missing 2 11
The health benefits, side effects and risks have been considered in formulating the recommendations
The effects of the recommendations (health benefits, side effects, risks) are not mentioned; however, some questions address some of the effects (e.g. complications, Chap. 2.17)

## 12
There is an explicit link between the recommendation and the supporting evidence AGREE recommends that each recommendation should be linked with a list of references on which it is based 2 [bib_ref] Driving after repair of groin hernia, Amid [/bib_ref] The guideline has been externally reviewed by experts prior to publication

## ''the appraisal of guidelines for research & evaluation (agree) instrument was used to validate the guidelines
Almost all criteria were fulfilled. Review was performed by four external experts in surgery and epidemiology. Two members of the Dutch Cochrane Institute performed a rigorous analysis which led to many adjustments''
Did the reviewers use AGREE also? How was the review done?
Which criteria were not fulfilled? The guideline is supported with tools for application ''The EHS is developing a skills and teaching institute to facilitate and train surgeons and residents to be able to work according to the guidelines''
A summary of the conclusions and recommendations, a flow chart and patient information are available, educational tools are under development 3

## Applicability

## 19
The potential organisational barriers in applying the recommendations have been discussed Open Access This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. The guideline presents key review criteria for monitoring and/or audit purposes
Registration is under development 3

## Editorial comments 22
The guideline is editorially independent from the funding body Development of the guideline was financed through a grant by Ethicon, a medical device company. Ethicon would not become owner and would not interfere with the methods and contents. We are not able to know if the recommendations are completely independent from the sponsor 3 23

## Conflicts of interest of guideline development members have been recorded
Members with no conflicts of interest were sought. However, conflicts of interest were not recorded
[fig] Figure 5: Pooled data of eight studies on the use of antibiotic prophylaxis in the prevention of wound infection after mesh inguinal hernia repair Training [/fig]
[fig] ': A pilot study among targeted users was performed in two large district hospitals in The Netherlands in 2002. There were no barriers to implementation either in costs or logistical possibilities. There are possibly European Countries where certain hospitals cannot afford endoscopic surgery Investigation of the barriers was based on the pilot in 2002 3 [/fig]
[table] Table 1: Transparency of the process and methodThe Steering Committee first met in Torino in December 2005. A Working Group was installed. The Working Group participated in a two-day workshop in Amsterdam in April 2007. A short course in evidence-based guideline development (EBGD) and clinical appraisal was followed, after which all relevant literature was searched in the Cochrane Database, Medline and Embase.In September 2007, the Working Group had a one-day meeting in Amsterdam. Participation in the course ''Evidence-Based Guideline Development'' by Dr. Anco Vahl was desirable. [/table]
[table] Table 3: Long-term follow-up ([36 months) of RCTs comparing Shouldice with different mesh techniques years follow-up, a random analysis is used because of the clinical and methodological diversity. The Shouldice technique performs significantly worse regarding the recurrence odds ratio (OR) of 1.99 (95% confidence interval [CI]: 1.05-3.79), but it does not significantly differ compared to mesh techniques regarding moderate and severe pain OR 1.16 (95% CI: 0.44-3.02). [/table]
[table] Table 4: Long-term follow-up ([48 months) of RCTs comparing endoscopic mesh techniques (TEP/TAPP) with Lichtenstein mesh repair [/table]
[table] Table 5: Outcome parameter: numbness (%) 2003 Douek et al. TAPP vs. Lichtenstein 0 vs. 14.5 [/table]
[table] Table 7: Results of individual studies on the use of antibiotic prophylaxis in the prevention of wound infection after mesh inguinal hernia repair (RCTs) TAPP transabdominal preperitoneal, NNT number needed to treat [/table]