What role does the gluteus medius play in lower extremity movement?

• A. Extension of the knee
• B. Abduction of the hip
• C. Flexion of the hip
• D. Adduction of the hip

Answer: (B)

The gluteus medius plays a crucial role in the abduction of the hip. This muscle is located on the outer surface of the pelvis and is primarily responsible for moving the thigh away from the midline of the body. When the gluteus medius contracts, it helps stabilize the pelvis during activities like walking, running, and standing on one leg. This stabilization is particularly important for maintaining balance and preventing excessive lateral movement of the pelvis, which can lead to hip and lower back injuries. Understanding the function of the gluteus medius is important for assessing lower extremity movement and ensuring proper biomechanics during various activities.