Which action is common to both the gluteus medius and gluteus minimus?

Which action is common to both the gluteus medius and gluteus minimus?

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

Answer: (A)

The key action shared by gluteus medius and gluteus minimus is abduction of the thigh at the hip. Both muscles originate on the outer surface of the ilium and insert on the lateral aspect of the greater trochanter, positioning them to pull the femur away from the midline. This abducting power is crucial for keeping the pelvis level during single-leg stance and while walking, preventing the pelvis from tilting downward on the opposite side. In addition, when the hip is flexed, the anterior portions of these muscles can help medially rotate the thigh, but their primary, defining shared function is abduction. The other actions listed—flexion, extension, and lateral rotation—are not the shared primary roles of these two muscles, as extension is mainly handled by gluteus maximus and lateral rotation by other deep hip rotators.

The key action shared by gluteus medius and gluteus minimus is abduction of the thigh at the hip. Both muscles originate on the outer surface of the ilium and insert on the lateral aspect of the greater trochanter, positioning them to pull the femur away from the midline. This abducting power is crucial for keeping the pelvis level during single-leg stance and while walking, preventing the pelvis from tilting downward on the opposite side.

In addition, when the hip is flexed, the anterior portions of these muscles can help medially rotate the thigh, but their primary, defining shared function is abduction. The other actions listed—flexion, extension, and lateral rotation—are not the shared primary roles of these two muscles, as extension is mainly handled by gluteus maximus and lateral rotation by other deep hip rotators.