Patellar dislocation generally refers to a sudden weakness of the knee joint when walking or running, with obvious restriction of movement, pressure pain in the knee joint, a feeling of tenderness in the knee, and difficulty walking (commonly known as “soft retreat”), with some patellar dislocation to the outside, accompanied by a ringing sound, and in some cases a feeling of knee locking, which can be reset by extending the knee and gently pushing with the hand. The knee can be reset by extension and gentle pushing. If left unattended for a long time, it may cause pain, instability, locking, dislocation and swelling of the knee joint. Conservative treatment for patellar dislocation includes rest, medial femoral exercise, cast fixation or other physical orthoses, etc. Conservative treatment has a series of sequelae such as knee pain, patellar instability and recurrent dislocation, and the recurrence rate is high, which can even cause the occurrence of osteoarthritis. The treatment should be arranged as soon as possible. In most cases of patellar subluxation and patellar subluxation, surgery can be performed within 1 week after the injury to prevent the development of traumatic arthritis. In cases of partial dislocation with mild joint swelling, surgery can be performed within 1 week to remove the trauma-induced osteochondral debris as soon as possible to reduce the occurrence of secondary injuries. For severe dislocations and subluxations with significant swelling and limited joint movement, the knee can be immobilized with a brace for 1 to 3 weeks after the injury, and surgery can be performed after the swelling subsides and the knee function is restored to avoid postoperative joint stiffness. Currently, many scholars believe that arthroscopic release of the lateral support band has the advantages of simple operation, light trauma, and quick recovery.