Surgery for acromioclavicular joint dislocation is performed through incision and internal fixation or distal clavicle resection to treat dislocation of the acromioclavicular joint. Dislocation of acromioclavicular joint is often caused by direct external force, such as strong external impact on this joint when falling, and a few are caused by indirect violence. Dislocation manifests itself as pain and swelling of the shoulder, and limitation of activities such as abduction or rotation. 1. Incision and internal fixation: when the displacement of the joint is more than 2 cm after dislocation, surgery is needed, and if the joint can be reset, incision and internal fixation will be performed, and a triangular towel will be used to fix the activity for 2 weeks after the operation. 2. Resection of the end of the clavicle: for dislocation that fails to be reset and has completed necrosis of the surrounding tissues, the caudal end of the clavicle is directly resected. The patient concerned should seek immediate medical attention to identify the cause of the disease and target treatment.