The hamstring will not break with proper practice, but if it is subjected to severe external impact and improper training, it will be at risk of rupture. The knee tendons, or knee ligaments, include the medial collateral ligament, lateral collateral ligament, anterior cruciate ligament, and posterior cruciate ligament. These ligaments can be ruptured when bending excessively, or when a violent external impact occurs. Knee rupture is mainly manifested as a tearing sensation in the joint, obvious pain in the knee joint, swelling of the soft tissues around the joint, fullness of the joint space, reduced joint stability, and limited knee joint activities. Knee ligament rupture requires surgical treatment to repair or reconstruct the damaged ligament. Surgery is followed by immobilization in a cast or brace. It is recommended to visit the hospital for timely treatment or therapy after a ruptured knee tendon exercises flexion.