A hamstring is one of three muscles at the back of the thigh - semitendinosus, semimembranosus or biceps femoris - which work to bend the knee. 

semitendinosusSemitendinosus - view from the back of the knee
semimembranosusSemimembranosus - view from the back of the knee
biceps femoris component of the hamstrings musclesBiceps femoris - view from the back of the knee


The hamstring used in graft construction

The tendon of semitendinosus is commonly harvested and used in hamstrings grafts for cruciate ligament reconstruction.



Semitendinosus tendon regeneration after anterior cruciate ligament reconstruction: can we use it twice?. Stevanović V, Blagojević Z, Petković A, Glišić M, Sopta J, Nikolić V and Milisavljević M. Int Orthop. 2013 Dec; 37(12): 2475–2481.

See also -