Hip Abductor Function During Trendelenburg Test

Study Overview
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Brief Summary
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This study will use electromyography and dynamometry to evaluate gluteal muscle activation during the Trendelenburg hip abduction test in different hip positions.

Detailed Description
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The Trendelenburg test is commonly used to assess hip abductor weakness. However, it is unclear which hip position during this test best isolates gluteal muscle function. This study will measure gluteus medius and minimus activation and hip abduction force in 30 healthy participants performing the Trendelenburg test. Different hip flexion, extension, adduction and abduction angles will be evaluated to determine which position optimally targets the gluteal muscles. Results may enhance utilization of the Trendelenburg test in clinical practice.

Official Title
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Electromyographic Evaluation of Hip Abductors During the Trendelenburg Test

Conditions
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Weakness, Muscle

Intervention / Treatment
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* Diagnostic Test: Trendelenburg hip abduction test


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy adults aged 18-45 years No history of hip disorders Exclusion Criteria: Contraindications to EMG Neurological or muscular disorders

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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All

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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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Healthy Adults<br>At least 30 healthy adult participants aged 18-45 years performing the Trendelenburg hip abduction test | Diagnostic Test: Trendelenburg hip abduction test<br>* The Trendelenburg test performed at different hip flexion, extension, adduction and abduction angles.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Gluteus Medius Activation | Mean EMG activity of the gluteus medius during the Trendelenburg test at different hip positions. Measured bilaterally in microvolts (μV). | Baseline | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Gluteus Minimus Activation during Trendelenburg Test | Mean muscle activation amplitude (measured in microvolts, μV) of the gluteus minimus during the Trendelenburg hip abduction test across a range of hip flexion, extension, adduction and abduction angles from 0 to 45 degrees. Measured bilaterally using surface electromyography electrodes placed on the muscle belly of the gluteus minimus. | Baseline | 
| Hip Abduction Strength during Trendelenburg Test | Maximum voluntary isometric hip abduction strength (measured in Newtons, N) during the Trendelenburg hip abduction test maneuver. Measured bilaterally at each combination of hip flexion, extension, adduction and abduction angles using a stabilized handheld dynamometer placed just proximal to the lateral femoral condyle. | Baseline |