Dislocation of the arm mainly refers to the arm out of the normal anatomical position, thus causing the joint part of the void and the limb part of the swelling, pain and activity limitation. This situation is mostly due to trauma, especially after trauma caused by ligaments around the arm, joint capsule injury, it will cause the arm part of the joint out of the arm, resulting in dislocation of the arm. In addition, in the middle-aged and elderly people, arm degeneration, ligament and joint capsule laxity can also lead to arm dislocation. Therefore, after the occurrence of this situation, if it is caused by trauma, we must promptly consult the doctor to carry out the reset treatment, and after the reset to limit the arm activities for three weeks, so as to give the damaged ligaments, joint capsule to create the conditions for repair. Middle-aged and elderly people with arm dislocation, can be performed joint capsule, ligament tightening surgery, to restore the normal anatomy of the arm joint.