There is more than one joint in the shoulder. What you choose to do about your shoulder arthritis depends on where the arthritis is and how severe it is.
Below is a typical case of severe arthritis in the ball and socket portion of the shoulder joint.
Arthritis is actually relatively uncommon in this joint. But when it occurs it tends to show a distinct pattern. The hallmark of arthritis at the ball and socket shoulder joint is joint space narrowing bone spurs at the bottom of the ball portion of the joint.