The rotator cuff is a group of muscles and tendons that surround the shoulder joint, keeping the head of your upper arm bone firmly within the shallow socket of the shoulder. They are also referred to as the SITS muscle, with reference to the first letter of their names (Supraspinatus, Infraspinatus,Teres minor, and Subscapularis, respectively). The muscles arise from the scapula and connect to the head of the humerus, forming a cuff around the glenohumeral (GH) joint. A rotator cuff injury can cause a dull ache in the shoulder, which often worsens with use of the arm away from the body.
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