Sartorius action?

Sartorius action?

• A. Abduction at hip
• B. Extension at knee; flexion at hip
• C. Medial rotation at knee
• D. Flexion at knee; flexion and lateral rotation at hip

Answer: (D)

The sartorius acts across the anterior thigh to influence both the hip and knee. It helps flex the hip and, at the same time, laterally rotate the thigh, and it also crosses the knee to allow knee flexion. When the knee is bent, it can assist with medial rotation of the leg. So choosing knee flexion together with hip flexion and hip lateral rotation best captures its main actions. The other options either omit key movements (hip flexion, knee flexion) or describe actions the muscle doesn’t primarily perform (like knee extension or only abduction).