The most mobile joint in the body is the shoulder. Since it is the most mobile joint, it is also unstable, and injuries to this joint are numerous and quite common. The bones that make up the shoulder girdle are the clavicle, scapula and humerus. These 3 bones articulate and form a functional unit. There are 4 joints in the shoulder girdle: acromioclavicular, sternoclavicular, glenohumeral and scapulothoracic joints. The muscles that are responsible for the movements of the shoulder joint are divided into 3 groups: muscles that start from the chest wall and are attached to the humerus and sternum, then muscles that start at the spines of the vertebrae and rotator muscles. The role of the muscles is to actively stabilize the joint. The muscular sheath formed by 4 muscles is called the rotator cuff. The muscles that make it up are the subscapularis, supraspinatus, infraspinatus and teres minor and the biceps brachii muscle, which also functionally belongs to the cuff. Shoulder movements are possible in all 3 planes. As for injuries, they are numerous and quite common. One of the more common injuries is a rotator cuff tear. Rupture of the cuff can be diagnosed by ultrasound, magnetic resonance, Xray and clinical tests. In the case of minor ruptures, conservative treatment is generally applied (electrotherapy, massages, cryotherapy), and if it is a large rupture, the treatment is operative. There are 3 operative methods: open method, mini-open method and arthroscopic method. Each of them carries its own risks, but the least risky is arthroscopic. The advantages of arthroscopy are: smaller incision, preservation of the grip of the deltoid, faster rehabilitation and smaller incision. Postoperative rehabilitation follows the operation. In the case of rotator cuff ruptures, the rehabilitation protocol consists of 4 phases. The program is determined individually for each patient and it is very important that both the patient and the physiotherapist approach the entire process seriously.