The shoulder has a wide and versatile range of motion. When something goes wrong with your shoulder, it hampers your ability to move freely and can cause a great deal of pain and discomfort. The shoulder is a ball-and-socket joint that has three main bones: the humerus, the clavicle , and the scapula. These bones are cushioned by a layer of cartilage. There are two main joints. The acromioclavicular joint is between the highest part of the scapula and the clavicle. The glenohumeral joint is made up of the top, ball-shaped part of the humerus bone and the outer edge of the scapula. This joint is also known as the shoulder joint. The shoulder joint is the most mobile joint in the body. It moves the shoulder forward and backward. It also allows the arm to move in a circular motion and to move up and away from the body. Shoulders get their range of motion from the rotator cuff.
