ACL injury is a common sports injury that can also manifest itself as a life production injury. Famous athletes such as Rose and Rondo who played in the NBA, and soccer players such as Ronaldo and Irving, have suffered from this disease. The ACL is a device that maintains the stability of the knee joint and controls excessive forward movement and flexion of the lower leg. The mechanism of the injury is usually a sharp stop in sports, rotation or car accident and trauma, etc. After the injury, the knee will usually fall to the ground, the joint will swell and cannot walk, and after a period of bed rest, the knee can resume walking, and those with good muscle strength can even resume sports, but the injured ACL is no longer useful. This time will be compensated by the meniscus and knee cartilage, slowly these “overworked” meniscus, cartilage will break, leg pain, knee popping, interlocking, this is the secondary damage of ACL injury, the disease will be a long course of premature degeneration of the knee joint, so, once the ACL injury is diagnosed, need Therefore, once diagnosed, ACL injury requires early surgical treatment to reconstruct the ligament and restore the stability of the knee joint.