Rotator Cuff Injury

A rotator cuff is a group of muscles and tendons in your shoulder. They help you lift your arms up and away from your body. The rotator cuff holds the ball of the humerus in the socket of the scapula. The shoulder is a ball joint that is part of the skeletal system. It's like a golf ball on a golf tee. Rotator cuff tears occur when the tendons separate from the arm bone. A tear can be the result of overuse or another injury.