Four important synovial joints used in most sporting actions are the elbow and shoulder joints in the arm, and the knee and ... made up of a round end of one bone that fits into a small cup ...

Medically reviewed by Jennifer Steinhoff, MD A rotator cuff tear is marked by damage to one (or more) of the four tendons ...

There are different types of shoulder arthritis depending upon the cause of the disease, Osteoarthritis (OA): Wear and tear ...