What action is common to all adductor muscles?

• A. Medial rotation of the hip
• B. Lateral rotation of the hip
• C. Flexion of the knee
• D. Extension of the hip

Answer: (A)

The key idea is how the adductor group works at the hip. All the adductor muscles pull the thigh toward the midline, and because they cross the hip joint in a way that their pull also aligns with turning the femur inward, they share a tendency to medially rotate the thigh. This medial rotation is the common action you’ll see across the whole group, regardless of whether individual muscles also flex, extend, or assist with knee movements in certain positions. Lateral rotation isn’t a typical action of these muscles, and knee or hip extension isn’t consistently produced by all of them, so medial rotation of the hip best captures what all adductors have in common.