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Joint Replacement Surgery

Knee Replacement
In knee replacement surgery, the ends of the damaged thigh and lower leg (shin) bones and usually the kneecap are capped with artificial surfaces lined with metal and plastic. Usually, doctors replace the entire surface at the ends of the thigh and lower leg bones. However, it is increasingly popular to replace just the inner knee surfaces or the outer knee surfaces, depending on the location of damage. This is called unicompartmental replacement. People who are good candidates for unicompartmental surgery have better results with this procedure than with total joint replacement. During surgery, doctors usually secure knee joint components to the bones with cement.

Hip Replacement
Total hip replacement surgery replaces the upper end of the thighbone (femur) with a metal ball and resurfaces the hip socket in the pelvic bone with a metal shell and plastic liner. Total hip replacement surgery replaces damaged cartilage with new joint material in a step-by-step process.

Shoulder Replacement
In shoulder replacement surgery, doctors replace 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.

Surgeons do most joint replacement surgeries using regional anesthesia. That means you can't feel the area of the surgery and you are sleepy, but you are awake. The choice depends on your doctor, on your overall health, and, to some degree, on what you prefer.

Your doctor may recommend that you take antibiotics before and after the surgery to reduce the risk of infection. If you need any major dental work, your doctor may 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.


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