The hamstring tendons in most cases do regenerate. Across the studies, the rate of regeneration varied between 50% to 100% for the semitendinosus tendon, and 46% to 100% for gracilis. ... Four of the studies found full regeneration after 1 year.

How long does it take for a hamstring tendon to regenerate?

The researchers found that the majority of athletes (70%) that had their ACL reconstructed with a hamstring autograft had regenerated the tendon. They noted that in some of the studies, tendon regeneration started at approximately one month post-op, but in all cases, regeneration occurred within one year of surgery.

What is Semitendinosus graft?

Semitendinosus/gracilis (STG) tendon autograft has been used effectively for restoring knee stability after anterior cruciate ligament (ACL) rupture. Though ACL reconstruction with STG autograft is an effective surgical technique for return to sports, short-term hamstring strength asymmetries exist after surgery.