Hamstring injuries occur frequently, with a high recurrence rate, in sports that require either high-speed skilled movements or excessive hip flexion with knee extension. A previous hamstring injury is the greatest risk factor for a future hamstring injury, which has led sports medicine professionals to search for improved postinjury rehabilitation strategies. Athletes may show postinjury structural changes in the muscle-tendon unit and be at risk for reinjury for up to a year after return to sport. Understanding the postinjury changes can help create practical applications for appropriate reconditioning and sports performance programs.
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