Shoulder Replacement Surgery

Learn How Your Shoulder Works

How the Shoulder Works2018-12-28T18:03:27-08:00
  • orthopedic icon

Tri-City Medical Center
4002 Vista Way
Oceanside, CA 92056

Learn More By Calling
855.222.TCMC Today!

How Does the Shoulder Work?

jointThe shoulder is made up of three bones: the upper arm bone (humerus), the shoulder blade (scapula), and the collarbone (clavicle). It is a ball-and-socket joint that allows for a wide range of motion.

The head of the upper arm bone (humerus) is the ball, and a circular depression (glenoid) in the shoulder bone (scapula) is the socket. The head of the upper arm bone is coated with a smooth, durable covering called cartilage that protects the bones and enables them to move easily. The rotator cuff is the collective set of surrounding muscles and tendons that provide stability, support, and work together with the deltoid muscle to move the shoulder.