Anatomy of the Shoulder
The shoulder joint is the most mobile joint given its “ball-and-socket”structure. The humerus (upper arm bone) acts as the ball, and the scapula (shoulder blade) as the socket.
Another important component of the shoulder joint’s mobility derives from the rotator cuff. The rotator cuff provides support to the shoulder’s many tendons and muscles bordering the joint. The rotator cuff’s tendons are protected by the bursa, a small bag of fluid-like solution acting like a cushion.
The Importance of the Shoulder
When tendons in the shoulder become inflamed or tear, they cause pain. The pain may occur with a variety of arm movement and rotation and may be temporary or chronic.