Anterior cruciate ligament (ACL) ruptures are primarily treated by wearing a brace, immobilization in a cast, and surgery. The anterior cruciate ligament (ACL) is an important tissue at the front of the knee that maintains the stability of the knee joint. When examined, an ACL injury often results in a positive anterior drawer test. If the anterior cruciate ligament is not completely ruptured, it can be treated by wearing a brace and immobilized in a plaster cast. If the ACL is completely ruptured, ligament reconstruction should be done arthroscopically, using either an allograft tendon, an autogenous tendon, or an artificial ligament as the graft material. The stability of the knee joint after ACL rupture can also be examined by the axial shift test. If the stability is poor, treatment should be carried out as soon as possible to maintain the stability of the knee joint, and patients with combined meniscus injury should choose the appropriate treatment plan according to the degree of meniscus injury.