what is considered a rotator cuff
The rotator cuff is a group of tendons and muscles in the shoulder, connecting the upper arm (humerus) to the shoulder blade (scapula).The rotator cuff tendons provide stability to the shoulder; the muscles allow the shoulder to rotate.The muscles in the rotator cuff include:1  Teres minor. 2  Infraspinatus. 3  Supraspinatus.he rotator cuff is a group of tendons and muscles in the shoulder, connecting the upper arm (humerus) to the shoulder blade (scapula). The rotator cuff tendons provide stability to the shoulder; the muscles allow the shoulder to rotate. The muscles in the rotator cuff include: 1  Teres minor. 2  Infraspinatus. 3  Supraspinatus.