Frequent dislocations of the arm may be caused by the following reasons: 1. The frequent dislocations are induced by local ligaments, joint capsule laxity and insufficient strength of the muscles around the joint; 2. After the first joint dislocation, the patient did not take sufficient brake and rest, but carried out some activities or some labor prematurely, and then the joint capsule did not close completely. If the patient is active again, or if he/she is subjected to work or external forces, the bone of the joint will be dislodged from the joint capsule again. If the dislocation is determined to be habitual, the patient may consider surgery to restore the tension of the joint capsule or ligaments, so that the condition can be fully recovered.