While we generally think of arthritis as being associated with old age, shoulder arthritis is not uncommon among younger people as well. Any injury to the shoulder, such as a dislocation or a fracture, can eventually lead to shoulder arthritis.
The shoulder consists of two main joints. The first is the glenohumoral joint. This is a ball-and-socket joint in which the head of the upper arm (humerus) fits into the glenoid cavity of the scapula (shoulder blade). The second is the acromioclavicular. This joint is formed by the meeting of the collarbone (clavicle) with the top of the scapula (acromion).
Hyaline cartilage located on the ends of these bones generally allows for movement of the arm in the socket without friction, but a loss of cartilage here can cause the bones to rub against each other. Although not as common as arthritis in other parts of the body, shoulder arthritis…
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