What special test is used to evaluate weakness of the gluteus medius?

The Trendelenburg test is specifically designed to evaluate the strength and function of the gluteus medius muscle. This muscle plays a crucial role in maintaining stability of the pelvis during single-leg stance and in hip abduction.

In this test, the patient is asked to stand on one leg. If the pelvis on the opposite side drops significantly during this stance, it indicates weakness in the gluteus medius on the stance leg. A positive result suggests a dysfunction or weakness in that muscle, as it fails to stabilize the hip and pelvis when required to support body weight on one leg.

The other tests listed focus on different aspects of musculoskeletal or neurological evaluation, such as hip joint pathology or reflexes, and do not specifically target the strength of the gluteus medius. Therefore, the Trendelenburg test is the correct choice for assessing this specific muscle's function.