Extracorporeal Shockwave Treatment for Greater Trochanteric Pain Syndrome

Study Overview
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Brief Summary
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Greater trochanteric pain syndrome (GTPS) is characterized by pain over the greater trochanter, which can refer down the lateral aspect of the hip. Historically, conservative treatments such as rest/activity modification, anti-inflammatory medication, physiotherapy and local corticosteroid injection, are employed as first-line management, with some refractory cases requiring surgical intervention. Acknowledging the unpredictable response and frequent recurrences associated with traditional non operative treatment, the risks and prolonged rehabilitation associated with surgery, and the favorable results from prior studies involving radial pressure waves as a treatment for GTPS, the aim of this study is to investigate the dose-related effect of focalized shockwave treatment at different total energy influx in patients with chronic GTPS.

Detailed Description
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Shockwave therapy (SWT) has been used successfully since the late 1980s for the management of various musculoskeletal disorders including plantar fasciopathy, achilles tendinopathy, shoulder calcific tendinopathy, and lateral epicondylitis. Although there are some negative trials, there are now many randomized, double-blinded, clinical trials that support the use of SWT for the above conditions. Acknowledging the unpredictable response and frequent recurrences associated with traditional non operative treatment, the risks and prolonged rehabilitation associated with surgery, the recognition of gluteal tendinopathy as a potential source of pain, and the favorable results from prior studies involving radial pressure waves as a treatment for GTPS, the aim of this study is to investigate the dose-related effect of shockwave treatment at different total energy by adjusting the energy flux density (EFD) in patients with chronic GTPS. The shockwave has been widely recognized in literature as a biological regulator, currently the biological effects of shockwaves can be obtained using lower energy than in the past. While the intensity or delivered energy is considered by some researchers to be a key factor for successful treatment, in current literature reviews, debate continues over the appropriate energy intensity and the total delivered energy that should be applied to the tissue. Therefore, higher intensity treatments usually require local anesthesia, which is known to reduce the efficacy of the treatment. Furthermore, some animal tests reported that an influx of energy of over 0.60 mJ/mm2 can cause permanent damage on the tendon. On the other hand, low-intensity energy is safer but has the disadvantage of lower treatment effects. The investigators hypothesize that a very low intensity protocol of ESWT has different effects on pain and function than a conventional protocol in a patient with GTPS syndrome.

Official Title
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Extracorporeal Shockwave Treatment in the Greater Trochanteric Pain Syndrome. Multicenter, Randomized, Controlled Clinical Trial

Conditions
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Mobility Limitation, Trochanteric Syndrome, Gluteal Tendinitis, Bursitis Hip, Pain Syndrome

Intervention / Treatment
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* Device: Duolith SD1, STORZ Medical, Switzerland with F-SW applicator


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients of either sex, aged oved 18 years, complaining of pain located anterior, lateral or posterior to the great trochanter for more than 3 months. Pain while lying on the affected side. Local tenderness on palpation of the area of the great trochanter of patients with this symptom as the reason for the consultation. Exclusion Criteria: Presence of signs and symptoms of another cause of regional hip pain. Presence of hip internal rotation 20° and extension deficit or other range of motion limitation 10º Previous hip surgery or use of ESWT for GTPS. Acute low back pain Vascular, neurologic, rheumatic diseases. Tumor in the area or local infection to the hip joint region. Pregnancy. Severe coagulation disorders.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Group A<br>3 weekly sessions of focused extracorporeal shockwave treatment (2.000 impulses at 0.20 millijoules/mm2 per session) | Device: Duolith SD1, STORZ Medical, Switzerland with F-SW applicator<br>* The procedure will be performed with the patient in lateral positioning of the decubitus. The treatment area will be prepared with a coupling ultrasound gel to minimize the loss of shockwave energy at the interface between the tip of the applicator and the skin. The inline ultrasonic guide will be used to concentrate the shockwaves on the pain area in the trochanteric region. No local anesthesia will be applied.<br>* Other names: ESWT;|
| Active Comparator: Group B<br>3 weekly sessions of focused extracorporeal shockwave treatment (2.000 impulses at 0.01 millijoules/mm2 per session) | Device: Duolith SD1, STORZ Medical, Switzerland with F-SW applicator<br>* The procedure will be performed with the patient in lateral positioning of the decubitus. The treatment area will be prepared with a coupling ultrasound gel to minimize the loss of shockwave energy at the interface between the tip of the applicator and the skin. The inline ultrasonic guide will be used to concentrate the shockwaves on the pain area in the trochanteric region. No local anesthesia will be applied.<br>* Other names: ESWT;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Visual Analogue Scale (VAS) for the estimation of the intensity of pain | The VAS provides a continuous scale for magnitude estimation and consists of a straight line, the ends of which are defined in terms of the extreme limits of pain experience such as 'no pain at all' and 'pain as bad as it could be'. Respondents mark the location on the 10-centimeter line corresponding to the amount of pain experienced. This gives the greatest freedom to choose pain's exact intensity. It also gives the maximum opportunity for each respondent to express a personal response style. VAS data of this type is recorded as the number of millimeters from the left of the line with the range 0-100. | 8 weeks after treatment (T2) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Harris Hip Score (HHS) to evaluate hip disability | The index consists of questions about pain and activities of daily living, referring to the previous week, and assessments of hip function (limping) and range of motion. Score ranges from 100 (no disability) to 0 (maximum disability). | 4 (T1), 8 (T2), 12 (T3) and 24 (T4) weeks after treatment. | 
| Lower Extremity Functional Scale (LEFS) | The LEFS is a self-report questionnaire to measure patients' initial function, ongoing progress, and outcome about Lower Extremity. Patients will answer the question Today, do you or would you have any difficulty at all with: in regards to twenty different everyday activities. The maximum possible score is 80 points, indicating very high function. The minimum possible score is 0 points, indicating very low function. | 4 (T1), 8 (T2), 12 (T3) and 24 (T4) weeks after treatment. | 
| Roles and Maudsley scale (RM) to evaluate patients satisfaction | The RM scale is a subjective 4-point patient assessment of pain and limitations of activity. The RM score has been used extensively at centers throughout the world to assess outcome after SWT. On the scale, 1 point indicates an excellent result with the patient having no symptoms. Two points indicate a good result with the patient significantly improved from the pretreatment condition and satisfied with the result. Three points indicate a fair result with the patient somewhat improved from the pretreatment condition and partially satisfied with the treatment outcome. Four points indicate a poor outcome with symptoms identical or worse than the pretreatment condition and dissatisfaction with the treatment result. | 4 (T1), 8 (T2), 12 (T3) and 24 (T4) weeks after treatment. | 
| EuroQoL five dimensions questionnaire (EQ-5D) to evaluate quality of life | The EQ-5D consists of two distinct sections.The first one is a subjective assessment for five dimensions (mobility, self-care, daily activities, pain / discomfort and anxiety / depression) and each item provides the option to choose a level of gravity. Each item provides graduated answers from 1 to 3. The Level 1 is no problem, while leveling 3 the extreme limitation. The aggregation of the responses forms a five-digit number that represents the state of health. The three levels of response, for each of the five items, produce up to 243 possible descriptions of the state of health and allow to highlight the presence / absence of any problems and the their intensity. The second section of the EQ-5D includes a VAS scale, represented graphically from a graduated scale ranging from 0 (worst possible health) at 100 (the best possible state of health) on which the interview indicates his perceived level of health status. | 4 (T1), 8 (T2), 12 (T3) and 24 (T4) weeks after treatment. | 
| Visual Analogue Scale (VAS) for the estimation of the intensity of pain | The VAS provides a continuous scale for magnitude estimation and consists of a straight line, the ends of which are defined in terms of the extreme limits of pain experience such as 'no pain at all' and 'pain as bad as it could be'. Respondents mark the location on the 10-centimeter line corresponding to the amount of pain experienced. This gives the greatest freedom to choose pain's exact intensity. It also gives the maximum opportunity for each respondent to express a personal response style. VAS data of this type is recorded as the number of millimeters from the left of the line with the range 0-100. | 4 (T1), 12 (T3) and 24 (T4) weeks after treatment. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Greater Trochanteric Pain Syndrome,, Gluteal, Tendinopathy, ESWT, shockwave