The anterior cruciate ligament is an important structure to maintain the stability of the knee joint, it plays a mechanical stabilization role because of the bond, but also because of the sensory nerve endings in the ligament, so the treatment of anterior cruciate ligament injury is very important, so how to treat anterior cruciate ligament injury? Generally common methods of ACL injury include: conservative treatment methods and surgical treatment methods. Indications for conservative treatment of ACL injuries: Not all patients with ACL injuries require surgery. The goal of both rehabilitation and surgery is to restore the lost joint stability after ligament injury and rebuild the “functional stability” of the joint. The first step is to determine whether there is joint instability in patients with ACL injuries, and the degree of motion of the joint instability. Joint instability is mainly manifested as walking movement “weak leg”, can not run fast, sharp turns, etc.. If patients can avoid the symptoms of joint instability through functional exercises or by reducing the intensity of sports, they can consider the conservative treatment of rehabilitation training. Jiang Tao, Department of Orthopedics, General Hospital Group, Huainan City, Anhui Province Indications for anterior cruciate ligament reconstruction. ① those with functional joint instability, i.e., unable to meet the patient’s needed joint function and achieve the patient’s ideal level of life and sports; ② those who also have meniscal injury and undergo meniscal repair surgery (without satisfactory joint stability, repairing the meniscus is difficult to heal); ③ the indications for reconstruction are relatively relaxed for patients younger than 50 years old; whether to reconstruct patients over 50 years old requires consideration of the anterior cruciate ligament injury before The degree of degeneration and function of the knee joint, the degeneration is serious tend to choose knee replacement surgery in the second stage. Surgical treatment of ACL injury: Modern scientific research has proven that due to the poor blood supply of the ACL, it is difficult to ensure the healing of the ligament by suturing the ligament severed ends, and the poor mechanical properties of the scar-repaired ligament cannot meet the function of stabilizing the knee joint. And the normal tension of the ACL is difficult to be achieved by open surgical sutures. Therefore, the method of suturing the severed end after ACL injury is now abandoned, both for open surgery and arthroscopic surgery. Currently, there is a basic consensus in the field of orthopedic sports medicine for intra-articular anatomical reconstruction after ACL injury. This is performed with a minimally invasive arthroscopic technique that reconstructs the ligament while simultaneously managing other combined injuries within the joint. Conversely incision of the joint capsule has been eliminated for many years and would be subject to complaints abroad. Moreover, the vast majority of physicians emphasize and advocate arthroscopic reconstruction in order to restore the injured person’s athletic ability and level of competition with the least possible surgical trauma by means of minimally invasive surgery.