The anterior cruciate ligament (ACL) is located in the knee joint and its main function is to prevent excessive anterior displacement of the tibia and rotational instability of the knee joint. Most patients have a history of acute knee trauma, with or without a tearing sensation in the joint at the time of injury, usually followed by pain and joint instability, and inability to complete ongoing movements, with the gradual increase in blood and pain accumulation in the joint and protective muscle spasm, immobilizing the knee in a flexed position and refusing any movement or activity. In individual cases, the ruptured ACL may become embedded in the joint space with typical joint locking (the joint is stuck) and the knee cannot be straightened. An ACL rupture of more than 6 weeks is considered an old injury. ACL rupture can cause significant joint instability, pain and swelling, knee joint laxity, easy sprain, patients are afraid to jump, afraid to do sudden acceleration running movements, can not turn sharply and stop sharply (playing basketball when passing people, folding and running, etc.), and even when going down the stairs, knee joint misalignment and other instability symptoms. The joint instability caused by ACL rupture can, over time, cause secondary damage to the meniscus and cartilage of the knee joint and degeneration of the joint. A complete rupture of the ACL should be treated surgically. At present, arthroscopic reconstruction of the ACL has been widely carried out and the technique is very mature, and arthroscopic treatment has the characteristics of less trauma and faster recovery after surgery. Therefore, if a rupture of the ACL of the knee occurs, it should be treated surgically as early as possible to avoid other secondary injuries.