Semitendinosus anatomy, origin, insertion, innervation and function, including clinical assessment, hamstring injuries, tendon grafting and rehabilitation exercises.

The hamstrings are a powerful muscle group on the back of the thigh, consisting of biceps femoris, semitendinosus and semimembranosus. These muscles play a central role in hip extension, knee flexion, pelvic control and lower limb stability during walking, running, sprinting and jumping. Because the hamstrings work across both the hip and knee, they are highly exposed to strain injuries, tendinopathy and reinjury, especially in sports with rapid acceleration and high eccentri