Acute patellar dislocation treatment points: 1. Acute patellar dislocation is best treated with emergency surgery to repair the medial support band under arthroscopy. Cheng Biao, Department of Orthopedics, Shanghai Tenth People’s Hospital 2, although there are examples and practices of successful conservative treatment. For example, six weeks of straight splinting after acute dislocation. However, because the medial patellofemoral ligament has been ruptured in patients with acute dislocation, conservative treatment cannot achieve the purpose of completely restoring the function of the medial patellofemoral ligament. Often the result of this treatment is a legacy of patellar subluxation due to weakness at the medial patellofemoral ligament. This results in the cartilage of the lateral surface of the patella and the lateral part of the articular surface of the femoral talus being worn down sooner or later in the future. Waiting for surgery at this point is not as good as one surgery in the acute phase to solve the problem completely. 3, many people’s patellar dislocation is not caused by injury alone, the same action, some people did not occur patellar dislocation, some people dislocated. Dislocation is often due to a deformity of a certain structure of the knee in addition to the injury action. For example, the medial head of the quadriceps muscle is congenitally weak, the patellofemoral joint relationship is inherently subluxated, the glide groove (the groove where the patella stays) is too shallow, and the lower stop of the patellar tendon is too far out and has a tendency to pull the patella outward for dislocation. All these problems cannot be solved by conservative treatment and are the main cause of re-dislocation after conservative treatment. 4, emergency surgery, if in a highly specialized hospital, the preoperative doctor will perform various examinations and measurements to understand the presence or absence of these deformities, and if there are these deformities, the correction of the deformities will be addressed together during the operation. If there is no deformity, it is enough to perform medial patellofemoral ligament (MPFL) suturing. 5, Never be careful not to perform a simple suture of the lateral support band, or suture of the MPFL plus release of the medial support band in a thousand patients with acute patellar dislocation without a comprehensive consideration, otherwise the postoperative result and the long-term patellofemoral joint relationship will be affected.