ACL ruptures are often combined with injuries to adjacent structures, such as meniscal injuries and medial and lateral collateral ligament injuries; therefore, early repair should be performed to reconstruct the ruptured ACL rupture while managing the combined injury. After timely surgical treatment and regular postoperative rehabilitation, ACL injuries in the knee have good outcomes and can restore most of the motor function and daily living ability, as well as greatly reduce the occurrence of complications associated with ACL rupture. There are almost no blood vessels in the ACL, and its nutrients are supplied by the synovial fluid in the joint capsule and the capillary network attached to the surface of the ligament. Therefore, the ACL cannot heal on its own after rupture. If it is simply sutured together, it will not grow together, and even if it is attached by scar, it will not be strong enough to withstand the normal stresses. Also, the ACL is old 6 weeks after the rupture, by which time the ligament has usually dissolved and absorbed in the joint fluid. Therefore, ACL injuries usually require ligament reconstruction surgery to restore function. If the opportunity for early repair is lost, varying degrees of knee instability are often left behind. An unstable joint is prone to repeated injury, accelerating damage to the articular cartilage, meniscus and other structures, leading to muscle atrophy or traumatic arthritis. There are many methods of late ligament reconstruction, but the long-term results are not ideal, and the function of the original ligament cannot be fully restored, often leaving varying degrees of joint dysfunction, and many patients end up with severe knee osteoarthritis and are forced to undergo artificial joint replacement surgery.