APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The primary hip extensors include the gluteus maximus, posterior head of the adductor magnus, and the hamstrings (TABLE 2).13, 17 In the anatomic position, the posterior head of the adductor magnus has the greatest moment arm for extension, followed closely by the semitendinosus.

Detailed explanation-2: -Otherwise the semimembranosus alone is an hip extensor and a knee flexor/intrarotator. In knee extension, the semimembranosus tendon prevents valgus, whereas in knee flexion it prevents external rotation. The distal semimembranosus complex stabilizes the posterior capsule through the oblique popliteal ligament.