Plyometric Training With or Without Hamstring Strengthening for Preventing ACL Injuries in Female Amateur Athletes

Inclusion Criteria: * Female amateur athletes between the ages of 18-30 years old. * Participating in sports that involve jumping, cutting and pivoting movements (e.g. basketball, soccer). * On average, athletes exercised between six and eight times per week including competition. * Able to perform basic jumping and landing mechanics safely. Exclusion Criteria: * Recreational athlete or untrained individual * Athletes with less than five training sessions per week. * Athletes who were operated with techniques other than the bone patellar-tendon, bone graft (BPTB), or who were operated by different surgeons and rehabilitated by several physical therapist. * Athletes with a history of muscle or joint injuries. * Athletes who had already followed a pre-operative rehabilitation program.