What Is a Rotator Cuff? Your rotator cuff is made up of muscles and tendons that keep the ball (head) of your upper arm bone (humerus) in your shoulder socket. It also helps you raise and rotate your ...
The shoulder is a ball-and-socket joint that connects the upper arm bone to the shoulder blade. Four muscles attach to the bones of the shoulder joint, and these form the rotator cuff. Performing ...
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