Which action is primarily performed by the gluteus medius?

Which action is primarily performed by the gluteus medius?

• A. Abduction
• B. Medial Rotation
• C. Flexion
• D. Extension

Answer: (A)

The action most characteristic of the gluteus medius is abduction of the thigh at the hip. Its fibers pull on the greater trochanter to move the femur away from the midline, which is why it’s key for keeping the pelvis level during single-leg stance and for normal gait. While some fibers can assist with medial rotation (anterior portion) or contribute to extension or lateral rotation in specific positions, those are secondary to the primary abducting action. Flexion is not the main job of this muscle, and extension is primarily handled by other muscles such as the gluteus maximus.

The action most characteristic of the gluteus medius is abduction of the thigh at the hip. Its fibers pull on the greater trochanter to move the femur away from the midline, which is why it’s key for keeping the pelvis level during single-leg stance and for normal gait. While some fibers can assist with medial rotation (anterior portion) or contribute to extension or lateral rotation in specific positions, those are secondary to the primary abducting action. Flexion is not the main job of this muscle, and extension is primarily handled by other muscles such as the gluteus maximus.