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Osteoarthritis, is the most common reason why a doctor would recommend a person to undergo a shoulder replacement surgery. Osteoarthritis though uncommon for shoulder joint, is caused by the degeneration of the joint over time through wear and tear which can be caused by ageing. Often, osteoarthritis can occur years after an injury to the shoulder. Damage is caused to the articular cartilage and other joint tissues by the extra movement or repeated dislocation of the unstable joint. Over time, this damage leads to osteoarthritis. Systemic diseases, such as rheumatoid arthritis, may affect any joint in the body. Whatever the type or cause of the arthritis, the shoulder may become painful and difficult to use. If this pain cannot be controlled or if it becomes impossible to use your shoulder for daily tasks, your doctor may recommend shoulder replacement surgery.
The Shoulder joint
There are two major types of artificial shoulder replacements: a cemented prosthesis and an un-cemented prosthesis. A cemented prosthesis is held in place by a type of epoxy cement that attaches the metal to the bone. An un-cemented prosthesis has a fine mesh of holes on the surface where the bone grows into the mesh. Over time, this anchors the prosthesis to the bone.
The surgeon determines the type of replacement joint based on your age, your lifestyle, and the surgeon's experience.
The prosthesis is made up of two parts, the humeral component replaces the humeral head, or the ball of the joint and the glenoid component replaces the socket of the shoulder, which is actually part of the scapula.
The humeral component is made of metal. The glenoid component is usually made of two parts. A metal tray attaches directly to the bone and a plastic cup forms the socket. The plastic is very tough and very slick, very much like the articular cartilage that it would be replacing.
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