What does a positive Trendelenburg sign indicate?

What does a positive Trendelenburg sign indicate?

• A. Weakness of the gluteus maximus muscle
• B. Weakness of the gluteus medius muscle on the opposite side
• C. Stability of the hip joint
• D. Strong core muscle engagement

Answer: (B)

A positive Trendelenburg sign indicates weakness of the gluteus medius muscle on the opposite side. This finding occurs when a patient stands on one leg, and the pelvis drops on the side opposite to the stance leg, suggesting that the gluteus medius on the supporting side is unable to maintain pelvic stability. The gluteus medius is crucial for maintaining balance and stability during single-leg stance, which is common in activities such as walking and running. When the muscle on the supporting side is weak, it fails to counteract the gravitational pull on the pelvis, leading to the observed drop. This sign is often used clinically to assess for hip abductor weakness and can be indicative of conditions such as hip osteoarthritis, gluteal tendinopathy, or other issues involving the hip joint and surrounding musculature. In contrast, weakness of the gluteus maximus would not typically present as a Trendelenburg sign and would manifest differently, perhaps affecting stance and power in movements like the sit-to-stand transition. Stability of the hip joint or strong core muscle engagement would not explain the specific observation of pelvic dropping during a single-leg stance, hence amplifying the importance of understanding the significance of gluteus medius function in

A positive Trendelenburg sign indicates weakness of the gluteus medius muscle on the opposite side. This finding occurs when a patient stands on one leg, and the pelvis drops on the side opposite to the stance leg, suggesting that the gluteus medius on the supporting side is unable to maintain pelvic stability. The gluteus medius is crucial for maintaining balance and stability during single-leg stance, which is common in activities such as walking and running.

When the muscle on the supporting side is weak, it fails to counteract the gravitational pull on the pelvis, leading to the observed drop. This sign is often used clinically to assess for hip abductor weakness and can be indicative of conditions such as hip osteoarthritis, gluteal tendinopathy, or other issues involving the hip joint and surrounding musculature.

In contrast, weakness of the gluteus maximus would not typically present as a Trendelenburg sign and would manifest differently, perhaps affecting stance and power in movements like the sit-to-stand transition. Stability of the hip joint or strong core muscle engagement would not explain the specific observation of pelvic dropping during a single-leg stance, hence amplifying the importance of understanding the significance of gluteus medius function in