Rotator Cuff

A group of four muscles on the shoulder blade with tendons that attach to the “ball” of the humerus.

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Your rotator cuff is a group of four muscles on your shoulder blade with tendons that attach to the “ball” of your humerus (upper arm bone).

These muscles and tendons help you to lift and rotate your arms. They also help hold the ball of your humerus firmly in your shoulder socket.

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