Shoulder replacements are usually performed to relieve pain. The most common type of shoulder replacement involves replacing the damaged bone and cartilage with a highly polished metal ball attached to a stem and a plastic socket.
Much like the hip joint, the shoulder is basically a ball-and-socket joint. The ball is the top of the humerus (arm bone) and the socket is within the scapula (shoulder blade). The design of this joint allows individuals a great range of motion at the shoulder.
TOTAL SHOULDER REPLACEMENT
Joint replacement involves surgery to replace the ends of bones in a damaged joint. This surgery creates new joint surfaces. In shoulder replacement surgery, your surgeon replaces the ends of the damaged upper arm bone (humerus) and usually the shoulder bone (scapula) or cap them with artificial surfaces lined with plastic or metal and plastic. Shoulder joint components may be held in place with cement. Or they may be made with material that allows new bone to grow into the joint component over time to hold it in place without cement.
The top end of your upper arm bone is shaped like a ball. Muscles and ligaments hold this ball against a cup-shaped part of the shoulder bone. Surgeons usually replace the top of the upper arm bone with a long metal piece, inserted into your upper arm bone, that has a rounded head. If the cup-shaped surface of your shoulder bone that cradles your upper arm bone is also damaged, doctors smooth it and then cap it with a plastic or metal and plastic piece. General anesthesia is often appropriate for joint replacement surgeries. Your surgeon may recommend that you take antibiotics before and after the surgery to reduce the risk of infection. If you need any major dental work, it may be recommend that you have it done before the surgery. Infections can spread from other parts of the body, such as the mouth, to the artificial joint and cause a serious problem.
Reverse Total Shoulder Replacement by Dr. Todd Kim
Dr. Todd Kim provides innovative shoulder replacement options to patients with shoulder joint compromise.
A standard total shoulder replacement is designed to work only if the rotator cuff muscles and tendons are in tact and working properly. If the rotator cuff muscles are not working properly, a Reverse Total Shoulder replacement is needed.
In a Reverse Total Shoulder replacement, the glenoid component is shaped like a ball and anchored to the scapula by screws. The humeral component then becomes the new socket of the joint and attaches to the upper end of the humerus.
The joint configuration of a Reverse Total shoulder replacement allows the patient to now us the deltoid muscle instead of the torn rotator cuff to lift the arm.