SEND THIS ARTICLE TO A FRIEND

Four muscles make up the group of muscles called the rotator cuff that help to keep the top of the arm in place in the  shoulder joint.  If we didn't have them you would find your shoulder joint dislocating each time that you tried lifting anything.  All four of these muscles connect to the shoulder blade or scapula at one end and the upper arm or humerus at the other and surround the shoulder forming a cuff of muscle around the shoulder joint, hence the name.