The rotator cuff is made up of 4 muscles and their tendons. They blend together to form a “cuff” that surrounds and supports the shoulder’s ball-and-socket joint. Without a rotator cuff, the rounded top of the humerus bone would not rest comfortably in its socket.
Rotator cuff tears can range in size from small (less than 1 cm) to large (about 3 cm or more). Full-thickness tears are tears that split a rotator cuff muscle into two pieces or pull a tendon off the bone. The symptoms you feel will depend on the size and location of the tear, as well as other factors.
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