bluuebunny/crossref_metadata_2025 huggingface dataset:
One Year Follow-Up of Patient Reported Outcomes Following Third Generation Minimally Invasive Chevron Akin Osteotomies (MICA) in Hallux Valgus Surgery
Authors: Lewis Thomas L. , Ray Robbie , Gordon David
Published: November 2020

Category:

Bunion

Introduction/Purpose:

The aim of this study was to explore the short-term results of third generation (using screw fixation) Minimally Invasive Chevron and Akin osteotomies (MICA) for hallux valgus correction. There is a paucity of published data regarding the outcomes of this relatively new technique. We present the largest series in the literature, using three separate validated patient-reported outcome measures (EQ-5DL, VAS Pain and Manchester Oxford Foot Questionnaire (MOXFQ), for this time point.

Methods:

A single surgeon case series of patients with hallux valgus underwent primary third generation minimally invasive chevron and akin osteotomies (MICA) for hallux valgus correction. Between August 2015 and January 2019, 430 MICAs were performed in 295 patients that were eligible for 1 year follow up. Baseline and 1 year post-operative patient reported outcomes were collected for 242 feet in 194 patients (182 females; 12 males). Paired t-tests were used to determine the statistical significance of the difference between pre- and post-operative scores.

Results:

The mean age was 55.9 (range 16.3-84.9, standard deviation (s.d.) 12.5). At one year follow up, the mean MOXFQ scores had improved for each domain: Pain; baseline 41.9 (range 0-100, s.d. 21.8), reduced to 13.8 (range 0-90, s.d. 17.7, p<0.001); Walking; baseline 34.6 (range 0-100, s.d. 24.3) reduced to 9.8 (range 0-89.0, s.d. 18.0, p<0.001); Social interaction; baseline 45.4 (range 0-100, s.d. 22.8), reduced to 8.2 (range 0-75.0, s.d. 14.7, p<0.001). Mean VAS Pain score improved from 29.8 (range 0.0-90.0, s.d. 22.1) to 8.2 (range 0.00-64.0, s.d. 12.8, p<0.001). Mean EQ-5D index score improved from 0.755 (range 0.066-1.000, s.d. 0.136) to 0.891 (range 0.350-1.000, s.d. 0.124, p<0.001). Mean EQ-5D VAS score improved from 83.4 (range 28- 100, s.d. 12.4) to 85.6 (range 0-100, s.d. 14.2, p=0.047).

Conclusion:

This is the largest prospective case series of short-term patient reported outcomes using a validated assessment method for hallux valgus, following third generation MICA to date. These data show that this technique is effective at improving foot and ankle specific patient reported outcomes at 1 year. This cohort is being followed over the longer term.
Radiological Outcomes of Third Generation Minimally Invasive Chevron Akin Osteotomies (MICA) for Hallux Valgus
Authors: Lewis Thomas L. , Gordon Robbie Ray; David
Published: November 2020

Category:

Bunion

Introduction/Purpose:

Minimally invasive surgery for hallux valgus has significantly increased in popularity recently due to smaller incisions, reduced soft tissue trauma, and the ability to achieve large deformity corrections compared to traditional treatments. This study aimed to investigate the radiological outcomes and degree of deformity correction of the intermetatarsal angle (IMA) and the hallux valgus angle (HVA) following third generation (using screw fixation) Minimally Invasive Chevron and Akin Osteotomies (MICA) for hallux valgus.

Methods:

A single surgeon case series of patients with hallux valgus underwent primary, third generation MICA for hallux valgus. Pre- and post-operative (6 weeks after surgery) radiological assessments of the IMA and HVA were based on weight-bearing dorso-plantar radiographs. Radiographic measurements were conducted by two foot & ankle fellowship trained consultant surgeons (RR, DG). Paired t-tests were used to determine the statistically significant difference between pre- and post-operative measurements.

Results:

Between January 2017 and December 2019, 401 MICAs were performed in 274 patients. Pre- and post-operative radiograph measurements were collected for 348 feet in 232 patients (219 female; 13 male). The mean age was 54.4 years (range 16.3-84.9, standard deviation (s.d.) 13.2). Mean pre-operative IMA was 15.3° (range 6.5°-27.0°, s.d. 3.4°) and HVA was 33.8° (range 9.3°-63.9°, s.d. 9.7°). Post-operatively, there was a statistically significant improvement in radiological deformity correction; mean IMA was 5.3° (range -1.2°-16.5°, s.d. 2.7°, p<0.001) and mean HVA was 8.8° (range -5.2°-24.0°, s.d. 4.5°, p<0.001). The mean post-operative reduction in IMA and HVA was 10.0° and 25.0° respectively.

Conclusion:

This is the largest case series demonstrating radiological outcomes following third generation Minimally Invasive Chevron and Akin Osteotomies (MICA) for hallux valgus to date. These data show that this is an effective approach at correcting both mild and severe hallux valgus deformities. Longer term radiological outcome studies are needed to investigate whether there is any change in radiological outcomes. Correlation with patient reported outcomes is planned.
Six Month Follow-Up of Patient Reported Outcomes Following Third Generation Minimally Invasive Chevron Akin Osteotomies (MICA) in Hallux Valgus Surgery
Authors: Lewis Thomas L. , Ray Robbie , Gordon David
Published: November 2020

Category:

Bunion

Introduction/Purpose:

The aim of this study was to explore the short-term results of third generation (using screw fixation) Minimally Invasive Chevron and Akin osteotomies (MICA) for hallux valgus correction. There is a paucity of published data regarding the outcomes of this relatively new technique. We present the largest series in the literature, using three separate validated patient-reported outcome measures (EQ-5DL, VAS Pain and Manchester Oxford Foot Questionnaire (MOXFQ), for this time point.

Methods:

A single surgeon case series of patients with hallux valgus underwent primary third generation minimally invasive chevron and akin osteotomies for hallux valgus correction. Between August 2015 and July 2019, 478 MICAs were performed in 328 patients that were eligible for 6 month follow up. Baseline and 6 month post-operative patient reported outcomes were collected for 340 feet in 267 patients (247 females; 20 males). Paired t-tests were used to determine the statistical significance of the difference between pre- and post-operative scores.

Results:

The mean age was 54.9 (range 16.3-84.9, standard deviation (s.d.) 12.8). At 6 month follow up, the mean MOXFQ scores had improved for each domain: Pain; baseline 42.5 (range 0-100, s.d. 22.6), reduced to 16.3 (range 0-100, s.d. 18.4, p<0.001); Walking; baseline 35.5 (range 0-100, s.d. 24.8), reduced to 12.2 (range s.d. 19.1, p<0.001); Social interaction; baseline 45.4 (range 0- 100, s.d. 22.6), reduced to 10.9 (range 0-100.0, s.d. 16.9, p<0.001). Mean VAS Pain score improved from 30.5 (range 0.0-90.0, s.d. 22.1) to 10.5 (range 0.00-78.0, s.d. 14.8, p<0.001). Mean EQ-5D index score improved from 0.752 (range 0.066-1.000, s.d. 0.133) to 0.872 (range 0.122-1.000, s.d. 0.133, p<0.001). Mean EQ-5D VAS score remained static from 82.7 (range 0-100, s.d. 13.3) to 83.7 (range 0-100, s.d. 17.8, p=0.386).

Conclusion:

This is the largest prospective case series of short-term patient reported outcomes using a validated assessment method for hallux valgus, following third generation MICA to date. These data show that this technique is effective at improving foot and ankle specific patient reported outcomes at 6 months. This cohort is being followed over the longer term.
The Radiographic Support for Distal Tibia Medial Opening-Wedge Osteotomy with Fibular Valgization Osteotomy for Medial Ankle Osteoarthritis
Authors: Lim Jung-Won , Jung Hong-Geun
Published: November 2020

Category:

Ankle; Ankle Arthritis

Introduction/Purpose:

Supramalleolar osteotomy (SMO) has recently been accepted as the major surgical option for treating painful asymmetric ankle arthritis. The effectivenss of additional fibular valgization osteotomy during SMO procedure is still controversial. This study aimed to evaluate radiological and clinical outcomes of medial compartment ankle osteoarthritis (OA) after SMO with fibular valgization osteotomy. Also, the study is aimed to describe the radiographic support for the SMO with additional fibular osteotomy in relieving the medial ankle pain.

Methods:

The study is based on 45 cases of medial compartment ankle arthritis (43 patients) with moderate to severe medial ankle pain (at least 1-year follow-up). SMO and fibular valgization oblique osteotomy was performed concomitantly in 37 ankles (82.2%). As for the functional evaluation, visual analogue scale (VAS) pain scores, American Orthopaedic Foot & Ankle Society (AOFAS) ankle-hindfoot scores and patient satisfaction were evaluated. On radiographs, tibial anterior surface angles (TAS), tibial lateral surface angles (TLS), and talar tilt angles (TT) were measured and the severity of ankle OA was classified by the Takakura stage. The evaluation of the effect of fibular valgization osteotomy entailed a comparison of new radiological measurement (medial clear space gap distance and talus center migaration distance) between two groups: Group 1 (with 37 cases of SMO with fibular valgization osteotomy) and Group 2 (with 8 cases of SMO without fibular valgization osteotomy).

Results:

The mean VAS pain score decreased from preoperative 6.5 to postoperative 1.3, and AOFAS score significantly improved from preoperative 60.4 to 88.3 at final follow-up. 91 percent (41 ankles) of the patients were satisfied with surgery. Mean TAS improved from preoperative 83.8° to postoperative 94.9° and TLS from 78.5° to 82.0°. 23 of 30 Takakura stage IIIa cases (77%) and 3 of 7 stage IIIb cases (42%) improved to stage II after SMO at final follow-up. Mean fibular valgization osteotomy angle was 12.4°. Medial gutter space gap distance improved from preoperative 0.7mm to postoperative 2.10mm. Talus center migration distance improved from -0.53mm to 2.03mm. Both radiologic parameters showed statistically significant differences between two groups, but there was no correlation between radiologic parameters and clinical outcomes.

Conclusion:

SMO for the patients with painful medial compartment ankle OA achieved favorable clinical and radiological outcomes. Also, high patient satisfaction (91%) as well as the improvement of Takakura stage was observed. SMO with additional fibular valgization osteotomy yielded widening of medial gutter space and recovery of talus center. Therefore, additional fibular valgization osteotomy during SMO could be optimal surgical option for the recovery of normal ankle mechanical axis.
Distance Mapping of the Foot and Ankle Joints using Weight Bearing CT: The Cavovarus Configuration
Authors: Lintz Francois , Jepsen Maui , Netto Cesar de Cesar , Bernasconi Alessio , Ruiz Maria , Siegler Sorin
Published: November 2020

Category:

Ankle; Hindfoot; Midfoot/Forefoot

Introduction/Purpose:

The cavovarus configuration sets the grounds for various pathological conditions, often involving the arthritic degeneration of the medial column. The objective of this study was to analyze the joint surface interaction at the ankle, hindfoot and midfoot joints using distance mapping on WBCT images in a series of cavovarus feet and compare them to normally aligned feet.

Methods:

In this case-control study, a database containing WBCT datasets from 370 feet (189 patients) obtained in a specialized foot and ankle unit from July 2016 to October 2018 was used. Ten feet (10 patients) with asymptomatic cavovarus shape were extracted (cases group; N= 10) and compared to 10 matched-paired (by age, gender and body mass index) normally aligned feet (10 patients) (controls group; N=10). Colored distance maps were generated for the ankle, hindfoot and midfoot joints and divided in zones, therefore differences were assessed between the two groups.

Results:

In the cavovarus group there was a significant increase in surface-to-surface distance at the posterior tibiotalar joint and a reduced distance at the anterior part, together with a greater distance at the posterior half of the medial gutter. Also, a decrease in surface-to-surface distance on the anterior half of the anterior facet and an increased distance on the posterior quadrants of the posterior facet of the subtalar joint were found. At the sinus tarsi, the lateral aspect of the talonavicular joint, the naviculocuneiform and the tarsometatarsal joints there was a statistically significant increase in surface-to-surface distance in cavovarus patients as compared to controls.

Conclusion:

In this study, the use of distance mapping analysis on WBCT images enabled to identify significant differences in surface-to-surface interaction at the foot and ankle joints between cavovarus and normally-aligned feet.
Early Weightbearing after Operative Fixation of Jones Fractures Does Not Delay Union
Authors: Looney Austin , Dean Daniel M. , Renehan John , Sanders Thomas H. , Cuttica Daniel J. , Neufeld Steven K.
Published: November 2020

Category:

Lesser Toes; Midfoot/Forefoot

Introduction/Purpose:

The Jones fracture of the proximal fifth metatarsal metadiaphysis is predisposed to delayed union and nonunion due to a tenuous blood supply. Surgical fixation followed by delayed weightbearing is commonly recommended, though the optimal period of nonweightbearing after surgery is not well defined. In response to more recent literature and in an effort to facilitate functional recovery, the trend in our practice has begun to shift toward earlier weightbearing for all patients after Jones fracture fixation. The purpose of this study is to investigate the effect of earlier weightbearing after surgical fixation of Jones fractures.

Methods:

All Jones fractures treated with an intramedullary (IM) screw in a large, urban practice from 2012-2018 were identified. We excluded fractures that were chronic in nature and patients with underlying metabolic disease. We defined a delayed union as longer than 12.5 weeks based on published data. Time to weightbearing and early weightbearing (within 1 week of surgery) were investigated as risk factors for delayed union using logistic regression and Fisher exact tests, respectively. The relationship between time to weightbearing and time to union was assessed with Spearman correlation. Additional variables were explored in bivariate analysis: time to surgery from initial presentation; age, sex, chronicity, tobacco use, weight, BMI, screw size; preoperative NSAID use, and postoperative VTE prophylaxis. Multivariate regression analyses were then performed to identify variables independently predictive of delayed union.

Results:

Forty-one cases were included (17 males, 24 females), all treated with IM fixation. Median age in the sample was 45 years ( IQR, 32-62 years). Overall mean time to union was 10.9 +- 7.0 weeks (range, 4.9-41.4 weeks). There were nine (22.0%) delayed unions. Earlier weightbearing was not significantly predictive of delayed union (OR 1.02; 95% CI, 0.99-1.05; P = 0.211), and the incidence of nonunion was not significantly different between early and delayed weightbearing groups (OR, 1.20; 95% CI, 0.02- 17.54; P > .999). In bivariate analysis, increasing age was associated with increasing risk of delayed union (OR, 1.06; 95% CI, 1.01- 1.12; P = 0.031), and was correlated with time to union (ρ = 0.327, P = 0.037). Mutivariate analaysis demonstarted no significant variables.

Conclusion:

Our results suggest that earlier weightbearing after internal fixation of Jones fractures is not a risk factor for delayed union and does not significantly alter healing time. These findings are consistent with previously published data, but go further by assessing the effects of time to weightbearing in continuous regression models.
Low Risk of Displacement with Early Weight Bearing of the Isolated Weber B Fracture: Results of a New Treatment Protocol
Authors: Madeley N. Jane , Obi Nnamdi , Senthil Kumar Chinnasamy , Rymaszewski Lech
Published: November 2020

Category:

Trauma; Ankle

Introduction/Purpose:

Truly isolated Weber B distal fibula fractures are stable injuries that usually recover well following non- operative treatment, however the concern over the possibility of a medial ligament injury, and ankle instability has traditionally lead to regular surveillance in the fracture clinics to exclude delayed talar shift developing. After recent studies suggesting this risk is low we introduced a new functional treatment protocol and present our early results.

Methods:

141 consecutive patients presenting acutely with isolated Weber B fractures without talar shift during a 12 months period were included. ED notes and radiographs were reviewed. All patients were splinted in a removable boot, and allowed to fully weight bear up to their comfort levels. Patients without signs of a medial ligament injury were then discharged from follow-up with advice to wear the boot for 6 weeks, an information leaflet and exercise sheet and a helpline number in case of difficulties. If they wanted clinic review this was organised. If signs of a medial ligament injury were documented, or the medial findings were not clear the patient was reviewed with up to date radiographs in the fracture clinic at 4 weeks post-injury. If talar shift developed the patient was to be converted to operative treatment. Olerud and Molander scores were collected between 6 and 12 months post- injury.

Results:

There were 51 patients without signs of medial ligament injury and of these 23 were discharged according to protocol and 28 patients attended fracture clinic. 89 patients had signs of medial ligament injury or no documented medial findings and of these 65 attended fracture clinic. One discharged patient re-accessed care. Of 93 patients reviewed in the fracture clinic none developed delayed talar shift. One underwent delayed ORIF for ongoing fibula discomfort and the remainder continued with non- operative treatment. 99 (70%) patients provided outcome scores. The mean Olerud and Molander score at a minimum of 6 months follow-up was 87 and the median score was 100. No significant difference was found between treatment arms. The scores were comparable to those in the published literature.

Conclusion:

We conclude the risk of delayed talar shift is low and satisfactory outcomes can be safely achieved with our functional protocol. Additional tests/imaging to establish the integrity of the medial ligament may be unnecessary.
Anatomical Risk Factors Associated with Rapid Progression of Hallux Valgus Deformity
Authors: Masashi Shinohara , Satoshi Yamaguchi , Yoshimasa Ono
Published: November 2020

Category:

Bunion; Other

Introduction/Purpose:

Hallux valgus (HV) deformity generally progresses gradually over the long term. However, the deformity progresses rapidly in some patients. Information on the future progression of the deformity helps treatment decision-making of both surgeons and patients. However, few studies have reported the natural progression of HV deformity. The purposes of this study were to clarify 1) the incidence and 2) anatomical risk factors of the rapid progression of HV deformity.

Methods:

Patients who visited the foot and ankle clinic of our hospital between 2013 and 2019 were retrospectively analyzed. Inclusion criteria were patients who underwent repeated foot radiographs with an interval of >=2 years. Exclusion criteria were patients <18 years old, history of first ray surgery, deformity or destruction of the first metatarsal head, and unable to stand plantigrade. The increase in HV angle between the baseline and the last follow-up was calculated. Then, patients were dichotomized into two groups: those with an increase in HV angle >=5°(Group P) and those with an increase of <5°(Group S). Radiographic measurements, including HV angle, Hardy’s sesamoid position, distal metatarsal articular angle, rounded metatarsal head, first metatarsal protrusion distance, were performed on the dorsoplantar and lateral foot radiographs at the baseline. The association between the baseline radiographic measurements and progression of HV deformity was assessed using the univariate and multivariate analyses.

Results:

A total of 268 feet of 268 patients (217 women and 51 men, mean age 61 years) were analyzed. The mean HV angle was 28°, and the mean interval between radiography was 49 months. Forty-five (17%) and 223 (83%) feet were categorized into groups P and S, respectively. The baseline Hardy’s sesamoid position was independently associated with the future progression of the deformity: 6/115 (5%) feet with normal sesamoid (grade <4) were in group P. On the other hand, 39/183 (21%) feet with laterally deviated sesamoid (grade>=4), 39 were in group P (p<0.001). The HV angle at baseline was not associated with the deformity progression (p=0.09). Other measurements, such as rounded metatarsal head, were also not associated with the progression.

Conclusion:

The rapid progression of HV deformity occurred in 1 out of 6 patients. Furthermore, the lateral deviation of the sesamoid on the dorsoplantar radiograph of the foot may be the risk factor of the rapid progression. For patients with mild deformity but deviated sesamoid, early corrective surgery may be justified to prevent the rapid progression of HV deformity.
Mid- to Long-term Follow-up of Total Ankle Arthroplasty using Salto Talaris Implant
Authors: Mathews Chelsea S. , Davitt James S. , Coetzee J. Chris , Norvell Daniel , Ledoux William R. , Sangeorzan Bruce J.
Published: November 2020

Category:

Ankle; Ankle Arthritis

Introduction/Purpose:

Total ankle arthroplasty (TAA) continues to be investigated as a primary treatment for end-stage ankle arthritis. The objective of this study was to report mid- to long-term results of the Salto Talaris TAA using patient reported outcomes and retention rates with mid- to long-term follow up.

Methods:

This was a multicenter retrospective study using prospectively collected data. 316 patients received a Salto Talaris TAA at one of three institutions from 2005-2015 were included in the study. Outcomes included subdomain scores of the SF-36 (bodily pain and physical function) and adverse events including additional surgeries or revision/removal of components.

Results:

Statistically significant improvements were seen in pain and physical function scores at 2 year follow up and were maintained through most recent follow-up. Retention rate of the prosthesis was >95% in all patients (30/32 at > 10 years, 272/284 at 4.5-10 years). 14 patients underwent revision or removal of prosthesis. 15 patients had additional surgery that did not involve revision or removal of components.

Conclusion:

Treatment of end-stage ankle arthritis with the Salto Talaris implant provides patients with improved pain and functional outcome scores in long-term follow up. Low revision rates demonstrate the durability of this prosthesis.
The Role of Deep Deltoid Ligament in Ankle Fracture Stability: A Biomechanical Cadaveric Study
Authors: McCormack Daniel , Kirmani Sayyied J. , Aziz Sheweidin , Faroug Radwane , Mangwani Jitendra
Published: November 2020

Category:

Ankle; Basic Sciences/Biologics; Trauma

Introduction/Purpose:

Supination-external rotation (SER) injuries make up 80% of all ankle fractures. SER stage 2 injuries (AITFL and Weber B) are considered stable. SER stage 3 injury includes disruption of the posterior malleolus (or PITFL). In SER stage 4 there is either medial malleolus fracture or deltoid injury. SER 4 injuries have been considered unstable, requiring surgery. The deltoid ligament is a key component of ankle stability, but clinical tests to assess deltoid injury have low specificity. This biomechanical cadaveric study specifically investigates the role of the components of the deep deltoid ligament in the stabillity of SER ankle fractures.

Methods:

In the first phase of the study, three specimens were utilised to standardise dissection of the deltoid ligament and creation and fixation of SER ankle fracture. In phase two, four matched pairs (8 specimens) were tested using this standardised protocol (Figure1). Specimens were sequentially tested for stability when axially loaded with a custom rig with up to 750N. Specimens were tested with: ankle intact; lateral injury (AITFL and Weber B); additional posterior injury (PITFL); additional anterior deep deltoid; additional posterior deep deltoid; lateral side ORIF. Clinical photographs and radiographs were recorded at each stage. In addition, dynamic stress radiographs were performed after sectioning the deep deltoid and following fracture fixation to assess talar tilt in eversion.

Results:

All specimens behaved in an identical manner when subjected to this standardised protocol. When the posterior deep deltoid ligament was intact, the ankle remained stable when loaded and showed no talar tilt on dynamic stress test. Once the posterior deep deltoid ligament was sectioned, there was demonstrable instability in all specimens. Surgical stabilisation of the lateral side using standard technique with a plate prevented talar shift but not talar tilt. In adequately stabilised ankle specimens, there was no loss of fixation on axial loading.

Conclusion:

This biomechanical cadaveric experiment demonstrates that under the standardised test conditions, all SER fracture ankle specimens with an intact posterior deep deltoid ligament behaved as stable injuries. The posterior portion of the deep deltoid ligament is a crucial structure in conferring stability to SER stage 4 injuries. The clinical implication of this is that when the posterior deep deltoid ligament is intact, SER fractures may be managed without surgical intervention in a plantigrade cast. We also conclude that without immobilisation, the talus may tilt in the mortise risking long-term deltoid incompetence.
Anatomic Relationship of the Sural Nerve when Performing Achilles Tendon Repair using the Percutaneous Achilles Repair System, a Cadaveric Study
Authors: McGee Roddy , Watson Troy S. , Eudy Adam , Brady Candice L. , Vanier Cheryl , LeCavalier Daniel , Hoang Victor C.
Published: November 2020

Category:

Sports; Trauma

Introduction/Purpose:

Minimally-invasive techniques for Achilles tendon repair are gaining popularity by orthopedic surgeons due to the reports of similar re-rupture rates with open versus percutaneous techniques with less wound complications and quicker recovery with percutaneous methods. The goal of the study was to quantify the relationship of the sural nerve to the Percutaneous Achilles Repair System (PARS) during Achilles tendon repair and identify sural nerve violations utilizing this system.

Methods:

The PARS was placed into ten lower extremity cadaveric specimens after simulation of an Achilles tendon rupture. After placement of the PARS jig and passage of the needles, careful dissection was performed in order to identify whether the sural nerve was violated and the distance of the sural nerve in relation to the passed needles was recorded.

Results:

Of the 10 cadaveric specimens, none had violation of the sural nerve during percutaneous needle passage. Zero of the 50 (0%) needles directly punctured the substance of the sural nerve, however, one needle was found to have come into close proximity separating the sural nerve and small saphenous vein but when the suture was passed and the PARS jig removed, the nerve was found remain intact with no evidence of entrapment.

Conclusion:

This study demonstrated the potential risk for sural nerve injury when using the PARS for Achilles tendon repair.
The Role of Weight-Bearing Computed Tomography Scan in Hallux Valgus
Authors: Metikala Sreenivasulu , Khamis Karim Mahmoud , Fryhofer George W. , Mehta Samir , Farber Daniel C.
Published: November 2020

Category:

Midfoot/Forefoot; Bunion

Introduction/Purpose:

Hyperpronation of the 1st metatarsal in hallux valgus (HV) is poorly understood by conventional weightbearing radiography. We aimed to evaluate this parameter using weightbearing computed tomography (WBCT) and understand its association with other standard measurements.

Methods:

Retrospective evaluation of WBCT and weightbearing radiographs (WBXR) was performed for 20 patients with hallux valgus (HV) feet and 20 controls with no such deformity. Axial CT images of both groups were compared for 1st metatarsal pronation angle (α angle) and tibial sesamoid subluxation (TSS) grades. The hallux valgus angle (HVA), first-second intermetatarsal angle (IMA), 1st metatarsal-medial cuneiform angle (MMCA), Meary’s angle, and calcaneal pitch (CP) angle of the study and control groups were compared on both WBXR and the corresponding 2D images of WBCT. All the measurements were independently studied by a dedicated musculoskeletal radiology fellow.

Results:

HV group demonstrated significantly higher values for TSS grade (p < 0.001) but not for α angle (p = 0.19) compared to controls. Pearson’s correlations of the α angle, in the HV group, revealed no significant linear relationship with TSS grades, IMA and MMCA, and only a moderate positive correlation with HVA as per WBXR (r = 0.38, p = 0.014) but not by WBCT (p = 0.084). Also, α angle performed within the range of a chance (AUC 0.64, 95% CI: 0.49 to 0.66) when measured by receiver operating characteristic (ROC) curves.

Conclusion:

The α angle - a measure of abnormal hyperpronation of the 1st metatarsal - is an independent factor that may co- exist with other parameters in HV, but in isolation has limited diagnostic utility. ‘Abnormal’ α angles may even be observed in individuals without HV deformity. An increase in the HVA, IMA, MMCA or TSS grade is not necessarily associated with a similar increase in the α angle and hence, the severity of HV deformity may not be judged on this parameter alone. The WBCT is a reliable method to assess hyperpronation and guide physicians during surgical management. [Table: see text][Table: see text]
Radiographic Union of Evans Osteotomy Without Fixation
Authors: Miles Megan R. , Gallagher Brian P. , Mistretta Katherine L. , Hsu Nigel N. , Wang Haijun , Guyton Gregory P.
Published: November 2020

Category:

Hindfoot; Other

Introduction/Purpose:

The Evans osteotomy is a lateral column lengthening procedure of the calcaneus that is commonly used to correct flexible flatfoot deformities. There is no consensus on whether fixation is needed to avoid nonunion and calcaneocuboid subluxation when performing this osteotomy. We assessed the nonunion rate and correlated extent of subluxation with graft size in an unfixed Evans osteotomy with an allograft wedge and no pinning of the calcaneocuboid joint at any point in the largest series of the procedure to date. Surgeries were performed in patients undergoing flexible flatfoot reconstruction.

Methods:

We retrospectively reviewed 120 consecutive patients who had undergone 145 unfixed Evans osteotomies by a single surgeon with allogenic bone graft for flatfoot reconstruction between January 2013 and October 2017, with a mean follow-up of 62.5 (range 9.4-266.7) weeks. The calcaneocuboid joint was not pinned during the procedure. Data were collected using clinical and radiographical examination during regular follow-up.

Results:

A total of 137 feet (94.5%) underwent a double calcaneal osteotomy with an associated medial displacement calcaneal osteotomy (MDCO). There was one nonunion (0.69%). The mean time to union was 10.8 (range, 6.7-17.9) weeks. There was significant improvement in all radiographic parameters postoperatively, including calcaneal pitch, talonavicular uncoverage, anteroposterior and lateral talo-first metatarsal angle, lateral column length, and naviculocuboid overlap (p<0.05). Minor postoperative calcaneocuboid joint subluxation (1.51 +- 2.3 mm) occurred in 72 of 118 feet (61.0%) and had no correlation with wedge size (r=0.06; 95% CI, -0.13, 0.24; p=0.6).

Conclusion:

An unfixed Evans osteotomy for symptomatic flatfoot deformity resulted in a significant improvement in the radiographic alignment of the foot with an exceptionally rare nonunion rate. Detectable calcaneocuboid subluxation was common but minimal in extent and was not correlated with wedge size in this series in which wedges were less than 12 mm in the maximum dimension. This report represents the largest series of the Evans procedure to date.
Clinical Outcomes of Anatomical Reconstruction of the Lateral Ankle Ligament Complex: A Systematic Review
Authors: Mulvin Conor , Toale James P. , Rosas Kevin , Hurley Eoghan T. , Kennedy John G.
Published: November 2020

Category:

Ankle; Sports

Introduction/Purpose:

Anatomical reconstruction has gained increased attention in recent years and is indicated for patients with poor-quality ligaments, previously failed lateral ligament repair, generalized ligamentous laxity, or in patients with a high BMI. The purpose of this systematic review was to evaluate the current literature on anatomical reconstruction of the lateral ligaments in the treatment of chronic ankle instability.

Methods:

A systematic search of Pubmed, EMBASE and Cochrane Library databases was performed during October 2019. The studies included were carefully evaluated with regard to level of evidence (LOE) and quality of evidence (QOE), clinical and radiological outcomes, complications, revision rates and return to sport.

Results:

Thirteen studies including a total of 296 ankles were included; 92% of studies were LOE III or IV and the QOE in all studies was of poor or fair quality. Within the autograft group, the AOFAS improved from 66.9 to 95.9, KPSSAF scores improved from 48 to 92.2, VAS scores improved from 6.8 to 0.2 at a follow up of 33.5 months, and the complication rate was 7.7%. Within the allograft group the AOFAS improved from 53.7 to 89.3, KPSSAF scores improved from 42.8 to 90.4, VAS scores improved from 7.3 to 1.9, and the complication rate was 7%. The overall rate of return to sport was 89%.

Conclusion:

The current systematic review demonstrated favorable results for both autograft and allograft reconstruction techniques in the treatment of chronic ankle instability. On comparing autograft and allograft techniques, minor differences were found both clinically and radiologically, with no overall evidence supporting one technique over the other
What is the Responsiveness and Quality of Life “Utility” for PROMIS Outcomes in Foot and Ankle Patients Following Physical Therapy?
Authors: Neville Christopher G. , Baumhauer Judith F. , Houck Jeff
Published: November 2020

Category:

Other

Introduction/Purpose:

Patients with foot and ankle conditions have been shown to demonstrate improvement in their generic outcomes using the Patient Reported Outcome Measurement Information System (PROMIS). However, the responsiveness to change and the impact change may have on quality of life has not been explored following non-operative care with physical therapy. The effect size (ES) is an assessment of the magnitude of change while the impact of change in physical function can be assed with quality of life utility scores. Therefore, the purpose of this analysis was to investigate the responsiveness of the PROMIS physical function (PF) scale on changes in quality of life.

Methods:

The PROMIS PF scale was available at the start and end of physical therapy treatment for 352 patients with foot and ankle ICD10 codes. PF was chosen as a good outcome measure to assess overall outcome from physical therapy care. Changes from baseline to post-care were examine using Cohen’s d to remove dependence on sample size and was interpreted as d=0.20 as a small effect, d=0.05 as a medium effect, and d=0.80 as a large effect. Using available isotonic regression with linear interpolation functions, health state utility scores were calculated from the PROMIS PF scores. These scores represent a health state between 0, representing ‘being dead’, and 1 being the utility of ‘full health’. This methodology has been shown to be reliable and valid for assessing overall health quality of life from changes in physical function. Repeated measures ANOVA models were used to compare outcomes across time.

Results:

A significant improvement (p<0.01) in PF scores was seen across the sample following physical therapy (PF t-score; baseline 38.6+-8.8; follow-up 45+-9.1). This change was associated with a moderate to large ES of 0.75. The average ES for those subjects with a starting t-score less than 45 (n=294) was 0.86 (large effect) while for those with a starting t-score of greater than 45 (n=58) was 0.27 (small effect). There was also a significant (p<0.01) improvement in utility scores following physical therapy (utility score; baseline 0.58+-0.2; follow-up 0.72+-0.2).

Conclusion:

There is a general improvement in reported physical function following physical therapy but the magnitude of this effect depends on baseline function. Lower function is associated with greater changes. Improvement in physical function was associated with an overall improvement in quality of life. The non-linear nature of utility scores suggests some patients may have large increases in quality of life with small changes in physical function.
Do Pre-Operative Transcutaneous Oxygen Perfusion Measurements Predict Atraumatic Major Lower Extremity Amputation Wound Healing?
Authors: Noori Naudereh B. , Haruno Lee , Schroeder Ian , Vrahas Mark , Little Milton T. , Lin Carol
Published: November 2020

Category:

Other

Introduction/Purpose:

Determining appropriate amputation level is a challenging task requiring clinical, laboratory, and imaging data. However, there is no validated consensus on the method with the most prognostic accuracy. Transcutaneous oxygen perfusion measurement (TcPO2) is a noninvasive means of measuring tissue oxygenation. A TcPO2 > 30-40mm Hg is widely cited as a positive predictor of post-operative wound healing, but its validity has not been well defined. We hypothesized that TcPO2 levels positively correlate with the success of amputation wound healing. Additionally, we secondarily investigated the correlation between other preoperative demographics and clinical variables and their impact on post-operative amputation wound healing.

Methods:

A retrospective chart review was performed on patients who underwent lower extremity above, through, or below knee amputations at a single institution with documented preoperative TcPO2 values between January 1, 2012 and December 1, 2018 and a minimum 30 days post-operative clinical follow up. Amputations performed for oncologic pathology, infected arthroplasty, osteomyelitis and traumatic amputations were excluded in order to isolate TcPO2 as a decision-making test for amputation level. This yielded one hundred and forty-one total amputations. Of these ninety-three were below knee amputations (BKA), six through knee amputations, and forty-two above knee amputations (AKA). Chi-square and t-tests were used to compare successful and failed amputations where appropriate.

Results:

Eighty-six of the amputations were successful and fifty-five failed, as defined by post-operative wound dehiscence or infection. Of these, thirty-seven were BKAs, four were through knee amputations and fourteen were AKAs. There was a significant difference in preoperative TcPO2 levels between the successful and failure groups at 46.2 and 38.3 respectively (p = 0.02). A TcPO2 of 30-40mm Hg had a success rate of 68.8%, and a TcPO2 < 20mm Hg a success rate of 18.2%. A receiver operating characteristic curve for TcPO2 levels predicting amputation success elucidated that with an area under the curve of 0.53 for the AKA cohort and 0.61 for the BKA cohort, the diagnostic ability is far from prognostic.

Conclusion:

Our results provide new insight into the predictive accuracy of preoperative TcPO2 levels. There is not a linear association between TcPO2 and success rate. A TcPO2 < 20mm Hg has a high positive predictive value for failure, but higher TcPO2 levels are not 100% predictive of amputation wound healing as reported by prior studies. Multiple factors should be considered when selecting amputation level.
A New Method for Reduction and Stabilization of the Distal Tibiofibular Syndesmosis
Authors: Baquero Andres E. O’Daly , Kreulen Timothy R. , Shafiq Babar , Hasenboehler Erik A. , Pisano Alfred
Published: November 2020

Category:

Ankle; Trauma

Introduction/Purpose:

Fixation strategies for distal tibiofibular syndesmotic injuries are associated with risk of malreduction. We describe a new method of reduction and fixation of the syndesmosis with two suture buttons placed through a single sagittal tunnel through the fibula and across the tibia at the attachment sites of the anterior and posterior-inferior tibiofibular ligaments.

Methods:

Eighteen frozen cadaveric lower leg specimens were divided in two groups of nine and subjected to syndesmotic injury followed by reduction and fixation. Nine were repaired with the new method and 9 with the conventional method. Post-reduction CT images were obtained and compared to pre-injury CT images to assess quality of reduction. Specimens were then tested on an MTS machine and loaded between +\-5Nm at 0.5Hz of internal and external rotation for 500 cycles. Cyclic loading was paused at 0, 100, and 500 cycles to assess torsional resistance, fibular rotation, and fibular translation with the foot first internally rotated 10 degrees and then externally rotated 15 degrees. Peak torque and translation of the fibula was measured.

Results:

A statistically significant difference was detected between groups, with the new method of fixation showing less lateral translation of the fibula. Data that did not reach statistical significance showed a trend towards decreased post reduction translation in the sagittal plane and improved rotational alignment with the new method. Decreased fibular rotation that reached statistical significance was noted in the new technique with internal rotation at 0, 100 and 500 cycles and during external rotation at 100 and 500 cycles. No differences were noted for torsional resistance or fibular translation between groups.

Conclusion:

The new method of syndesmotic fixation facilitated reduction of the syndesmosis that resulted in improved alignment, and better rotational stability compared with the conventional technique. This may be a reliable alternative to current methods of syndesmosis reduction and fixation.
Early Outcomes of Minimally Invasive Surgery Using Percutaneous Technique for Hallux Valgus
Authors: Park Jae Han , Park Kwang Hwan , Park Yoo Jung , Han Seung Hwan , Kim Sang B. , Lee Jin Woo
Published: November 2020

Category:

Bunion; Midfoot/Forefoot

Introduction/Purpose:

There are myriad procedures for hallux valgus deformity. Minimally invasive Surgery (MIS) using percutaneous technique has been recently introduced for the treatment of hallux valgus. The purpose of this study was to evaluate early radiological and clinical outcomes of MIS using percutaneous technique for hallux valgus deformity.

Methods:

This was a prospective cohort study of 19 feet (13 patients) undergoing operative correction of hallux valgus using MIFS technique with minimum 2-year of follow-up. Outcome measures include the visual analogue scale (VAS) for pain and the American Orthopaedic Foot & Ankle Society Hallux-Metatarsophalangeal-Interphalangeal (AOFAS-HMI) scale, Foot Function Index (FFI), hallux valgus angle (HVA), 1-2 intermetatarsal angle (IMA), and distal metatarsal articular angle (DMAA).

Results:

All patients were traced for a mean of 27.2 (range 24.7 - 30.4) months. The VAS, AOFAS-HMI scale and FFI were improved respectively with significance after operation (p<0.05). The mean HVA and 1-2 IMA showed significant improvements from 37.5’+-9.2 and 14.0+-3.1’ to 11.5+-7.9’ and 5.8+-3.6’ (p<0.05, p<0.05). The DMAA was decreased from 16.5+-3.9’ to 5.1+- 2.5’ (p<0.05). One patient underwent a revision surgery because of a screw loosening.

Conclusion:

The MIS using percutaneous technique for hallux valgus deformity achieved enough correction and relief of pain. All patients were satisfied with the clinical assessments. However, a long-term study is necessary to compare with other techniques.
Management of Periprosthetic Osteolysis after Total Ankle Arthroplasty
Authors: Park Yoo Jung , Park Kwang Hwan , Park Jae Han , Han Seung Hwan , Kim Sang B. , Lee Jin Woo
Published: November 2020

Category:

Ankle Arthritis; Ankle

Introduction/Purpose:

Periprosthetic osteolysis in total ankle arthroplasty (TAA) is a substantial problem. It may cause implant failure and has potential to affect long-term implant survival. To prevent major revisional arthroplasty, it is important to make an early diagnosis of osteolysis and decide an appropriate timing of surgical intervention such as bone graft. We report our updated result of bone graft for osteolysis after TAA associated with clinical and radiologic outcome.

Methods:

We retrospectively evaluated our consecutive series of 440 primary TAAs performed between May 2004 and August 2018 and identified those who had a subsequent bone graft procedure. A total of 38 bone graft procedures for periprosthetic osteolysis after TAA were performed. Mean time-interval between primary TAA and bone graft was 5.09 years (range 17.0 to 127.0 months). Location of osteolysis, bone grafting method and clinical outcome parameters using visual analog scale (VAS), American Orthopaedic Foot & Ankle Society (AOFAS) score were recorded.

Results:

Radiographs revealed periprosthetic osteolysis in 51.8% (58/112) of distal tibial lesions and 41.1% (46/112) of talar lesions. Autogenous iliac bone graft was used in most of procedures. Both mean VAS and AOFAS scores improved significantly at the last follow-up (p<0.05) One patient needed a repeat bone graft procedure with additional bone cementation after the primary bone grafting due to large cyst on distal tibia. There was no implant failure or major revisions after the bone graft.

Conclusion:

Bone graft for periprosthetic osteolysis may improve patient’s clinical outcome and give support to the structures surrounding the implant. Bone grafting in optimal timing may also improve implant survivorship. However, further study is needed for the etiology of newly developed painless osteolysis even after the bone graft.