Total Hip Replacement
|A total hip replacement is a surgical procedure to repair the hip-joint by partly (Hemi arthroplasty) or fully (Bipolar-hemi arthroplasty) replacing the original hip joint with prosthetic substitutes. Care needs to be taken with this operation because of the invasive nature of this procedure , it is cautiously deliberated if surgery is advised, to take account of age, medical problems, hip disease, activity status and possible fracture characteristics.
The hip is a ‘ball and socket’ joint. This means that the caput of the femur fits in the acetabulum of the pelvis. The ‘ball’ is the femoral head which fits into the socket is the acetabulum of the pelvis. This ball and socket design is what allows the poly-axial movement seen at the hip. The hip is made up of the pelvis and the femur. The pelvis is formed by 3 bones; the ischium, ilium and pubis. The femur is the longest and strongest bone in the human body. The acetabulum is cup-shaped providing the articular surface for the head of femur to move within. The head of the femur is gripped by the acetabulum beyond its maximum diameter. The caput of the femur and the inside of the acetabulum are covered with a layer of hyaline cartilage.
|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.
|In total elbow replacement surgery, the damaged parts of the humerus and ulna are replaced with artificial components. The artificial elbow joint is made up of a metal and plastic hinge with two metal stems. The stems fit inside the hollow part of the bone called the canal.
There are different types of elbow replacements, and components come in different sizes. There are also partial elbow replacements, which may be used in very specific situations. A discussion with your doctor will help to determine what type of elbow replacement is best for you.
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