1, Acute patellar dislocation is best treated with emergency surgery. 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. The 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, with 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) suture. 5, Never be careful not to perform a simple lateral support band release, or MPFL suture plus medial support band tightening in a thousand patients with acute patellar dislocation without comprehensive consideration, as this will affect the postoperative results and the long-term patellofemoral joint relationship. There are two common treatments after acute patellar dislocation: splint or cast fixation; and surgical treatment. Although conservative treatment with a fixation scheme will not dislocate again in many people after treatment, the problems with conservative treatment are: 1. The recurrence rate of patellar dislocation after treatment is high. 2. Even if patellar dislocation does not occur again after conservative treatment, because the rupture of the medial patellofemoral ligament (MPFL) and the medial patellar support band during acute patellar dislocation cannot be completely restored to normal after conservative treatment (only surgical suturing of the severed ends to each other has a chance to completely restore these structures), patellar subluxation is often left after conservative treatment. Patellar subluxation predicts abnormal wear and tear of the patellofemoral joint in the future, which will eventually lead to destruction of the patellofemoral joint or surgery. 3, acute patellar dislocation often has causative factors, such as natural tibial tuberosity distortion, femoral talar groove too shallow, quadriceps medial head born underdeveloped, etc. These problems can be corrected together after measurements are taken prior to surgery for acute patellar dislocation. Otherwise, even if the problem of acute dislocation is temporarily resolved, it may be dislocated again in the future. Because the root cause of dislocation is not removed. 4.Acute dislocation is often accompanied by cartilage damage and osteochondral blocks falling into the joint on the medial side of the patella and the lateral side of the femoral talus, and conservative treatment is not a good solution to this problem, such as taking out the osteochondral blocks and repairing the cartilage damage. 5, If there is a severe patellar subluxation left after conservative treatment or there is repeated subluxation, each severe subluxation of the patella sliding or each repetitive subluxation after reset will lead to patellofemoral joint cartilage impact injury, which eventually leads to surgical treatment. However, the results of delayed surgical treatment are greatly reduced compared to those in acute dislocations. Therefore, aggressive surgical treatment is recommended for acute patellar dislocation, which can, on the one hand, repair the MPFL and the medial patellar support band to restore them to a completely normal state; on the other hand, it can explore the joint and remove the osteochondral blocks that may have fallen out of it; it may also correct the root causes of patellar dislocation identified preoperatively, i.e., various deformities, and can repair the damaged cartilage surface intraoperatively, as well as prevent non-operative unnecessary consequences.