The rotator cuff consists of the tendons of supraspinatus, infraspinatus, teres minor and subscapularis muscles, which attach to the edge of the greater tubercle of humerus and the anatomical neck of humerus. The inner surface of rotator cuff is closely connected with the articular capsule and the outer surface is the subdeltoid bursa. Surrounding the upper end of the humeral head, the humeral head can be incorporated into the glenoid so as to stabilize the joint, assist shoulder joint abduction, and have rotation function. The supraspinatus muscle is attached to the upper part of the greater tubercle of humerus and often suffers from the abrasion of acromioclavicular ligament. From the point of view of anatomical structure and mechanical stress, this part is the weak point of the rotator cuff. When the shoulder joint engages in abduction abduction, it is liable to rupture. Because of the gravity of the limb and the pulling of the rotator cuff, the tear becomes larger and harder to heal.
Most of them are males over 40 years old. For young people, most of them have a history of severe trauma. Because rotator cuff is protected by acromion, direct violence rarely causes rotator cuff rupture. Indirect violence is mainly caused by degenerative upper extremity abduction of rotator cuff with age, sudden adduction of palm support and rupture, especially due to the weakness of supraspinatus muscle and the greatest traction, so it is easy to rupture, accounting for about 50%.
Rotator cuff injury can be divided into two types according to the degree of rupture: partial rupture and complete rupture. If not handled properly, partial rupture may develop into complete rupture.
(1) Clinical manifestations
Most of them are males over 40 years old. If the rotator cuff is broken, the patient often feels tear noise, local swelling, subcutaneous hemorrhage. The local pain after injury is limited to the shoulder top, which is released to the deltoid insertion point. The tenderness between the greater tubercle and the acromion
