The shoulder joint is the most flexible joint in the human body, which is a typical multiaxial ball and socket joint, and its structure is characterized by the humeral head and the glenoid of the scapula. The shoulder joint is mainly composed of the humeral head and the glenoid of the scapula, while the glenoid and glenoid labrum only hold 1/4 to 1/3 of the head, so the shoulder joint is also formed with the help of the joint capsule, muscles and tendons to form the final stable joint mechanism. The shoulder joint is a typical multiaxial ball and socket joint because it can perform flexion and extension, adduction and abduction, internal and external rotation, and circular rotation. Due to the anatomical characteristics of the shoulder joint such as capsule and ball and socket joint, the shoulder joint structure is easily damaged or destroyed by trauma to the joint capsule, tendons and even the bone structure of the joint, which needs to be repaired as soon as possible to restore its function.