Anatomy of the Shoulder
The shoulder joint has the most mobility of all joints. Being a ball-and-socket joint, there are many components in the shoulder joint that allow for this mobility. The humerus or upper arm bone is the ball, and the scapula or shoulder blade is the socket.
Another important component of the shoulder joints mobility derives from the rotator cuff. The rotator cuff’s main function is to provide support to the shoulder, consisting of many tendons and muscles that border the joint. The rotator cuff’s numerous tendons are protected by the bursa, a small bag of fluid-like solution that acts like a cushion.
The Importance of the Shoulder
When tendons in the shoulder that give mobility are inflamed, tear, or are affected by changes to surrounding bones, they cause pain. The pain may occur when you move your arm above your head, behind your back, or straight out in front of you. The pain could be temporary or it may continue and worsen.