what does the rotator cuff do
The rotator cuff is a group of 4 muscles and their tendons (which attach them to the bone). These muscles connect the upper-arm bone, or humerus, to the shoulder blade.The important job of the rotator cuff is to keep the shoulder joint stable.he rotator cuff is a group of 4 muscles and their tendons (which attach them to the bone). These muscles connect the upper-arm bone, or humerus, to the shoulder blade.