The semitendinosus muscle is one of the hamstrings muscles.
The semitendinosus muscle helps to bend the knee and extend the hip, and also has a function to inwardly rotate the knee.
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Because of its long tendon, the semitendinosus can be harvested using a tendon stripper, and then folded into four and used for cruciate ligament reconstruction. It can also be used to stabilise the patella in a tenodesis procedure.