Gluteus Maximus Transfer Following THA Does Not Improve Abductor Strength

Study Overview
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Brief Summary
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Gluteus maximus transfer following THA does not improve abductor strength - a case-control gait analysis study of 15 patients with gluteus medius disruption The investigators have compared 15 gluteus maximus transferred patients with the use of a gait analysis system based on reflective markers and force plates to objectively evaluate the gait performance pre- and postoperatively.

Detailed Description
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The gluteus maximus flap transfer (GMT) is a surgical technique to improve gait kinematics and kinetics as well as reduce pain and ameliorate functional outcome in patients with hip abductor deficiency of the gluteus medius following total hip arthroplasty (THA). The investigators used a gait analysis system based on reflective markers and force plates to objectively evaluate gait performance pre- and postoperatively. Methods Gait analysis was performed in 15 patients who underwent GMT and were examined with an optical tracking system before and at a minimum of 13 months after the operation. Mean age was 69 years (SD=11), all were females. Median follow-up time was 24 (13-60) months. The primary outcome was hip abduction moment (Nm/kg) during gait. The control group consisted of 66 subjects without any gait pathology.

Official Title
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Gluteus Maximus Transfer Following THA Does Not Improve Abductor Strength - a Case-control Gait Analysis Study of 15 Patients With Gluteus Medius Disruption

Conditions
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Hip Arthropathy

Intervention / Treatment
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* Procedure: Gluteus maximus transfer


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with hip abductor deficiency of the gluteus medius following total hip arthroplasty (THA) Exclusion Criteria: THA prior to the muscle transfer
Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Crossover Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Gait performance preop vs postop<br>Pre and postop | Procedure: Gluteus maximus transfer<br>* Gait analysis study of 15 patients with gluteus medius disruption<br>|
| Experimental: Gait performance postop vs controls<br>Postop vs controls | Procedure: Gluteus maximus transfer<br>* Gait analysis study of 15 patients with gluteus medius disruption<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Abductor strength measurement with use of an optical tracking system after Gluteus maximus transfer - a case-control gait analysis study of 15 patients pre- and postoperative with gluteus medius disruption | Gait analysis examination/measure will be performed preoperative with an optical tracking system in a gait laboratory using reflective markers and integrated force plates in order to record kinetics (Nm/kg) of abductor muscles moment in the frontal plane. | Preop | 
| Abductor strength measurement with use of an optical tracking system after Gluteus maximus transfer- a case-control gait analysis study of 15 patients pre- and postoperative with gluteus medius disruption | Gait analysis examination/measure will be performed 2 year postoperative with an optical tracking system in a gait laboratory using reflective markers and integrated force plates in order to record kinetics (Nm/kg) of abductor muscles moment in the frontal plane. | Postop 2 year |