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Like total hip replacement, the socket is fitted with a prosthesis
Despite constant improvement in the articulation of hip replacements, a certain amount of wearing is going on over time due to friction between the ball bearing and the socket surfaces. This mechanical wearing generates very small particles of metal, ceramic, cement or plastic which in turn collect in the tissues about the hip joint. The patient’s immune system has cells which clean up these foreign particles and dispose of them. Interestingly, this normal protection response can lead to the resorption and destruction of the bone that supports the socket and the stem through a process known as “osteolysis.”
In most hip replacements there is a metal stem that is fixed inside the tube-like femur (thigh bone) upon which is perched an articulating ball bearing; and a metal cup that is fixed within the acetabulum of the pelvis (socket) containing a bearing surface on the opposite side within which rides the ball bearing. The socket bearing surface is commonly a plastic (polyethylene) or a ceramic (glass); the ball bearing is commonly a highly polished metal or ceramic. Each of these come is variable sizes and are mixed and matched by the surgeon for various mechanical properties and chosen as each situation demands.
Total Hip Replacement -OrthoInfo - AAOS
Joint replacement surgery removes the damaged, painful parts of the hip and replaces them with a prosthesis made of metal and plastic. The artificial joint can relieve pain and improve mobility when your natural hip can no longer do its job. An artificial ball and metal stem replace the worn head of the thigh bone, and a metal cup and artificial liner replace the worn socket of the pelvis. The prosthesis allows the hip joint to move smoothly so that patients can enjoy a greater range of pain-free movement.
Revision hip replacement refers to the procedure to repair or replace a failed first hip replacement. Over the past three decades total hip replacement has become one of the most important surgical procedures to return patients to active, contributing members of society. The surgical procedure to replace a worn out, painful hip with prosthetic components () has been performed on millions of patients with great results and overall few complications. Once reserved for the senior citizen with a sedentary lifestyle, total hip replacement is rapidly becoming an operation in demand by a mid-life, still working patient population who demand high function and long lasting mechanical properties to coincide with a highly active lifestyle.
Reverse Shoulder Prosthesis (RSP) | DJO Global
The native hip is a ball and socket joint. The ball, formed by the femoral head, is held in the socket, formed by the pelvic acetabulum, by muscles, ligaments and the joint capsule. Hip replacement surgery involves removing the arthritic or diseased bone from the socket and removing the femoral head. The parts of the bone removed are replaced by artificial, or prosthetic, components.
An alternative to total hip replacement is an operation called hip resurfacing. Unlike the prostheses used in total hip replacement, which are made to replace the femoral head, resurfacing prosthesis designs allow the head to be preserved and reshaped. The resurfaced bone is then capped with a metal prosthesis. Like total hip replacement, the socket is fitted with a prosthesis.
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Revision Hip Replacement - Zehr Center Orthopaedics
For a hip replacement to function well, the ball must be retained within the socket at all times. Several factors must work in concert to keep this mechanical relationship intact, including proper alignment of the acetabular prosthesis (the socket) and the femoral prosthesis (articulating ball part). In addition, the muscles that attach to both the pelvis and the femur must be strong and able to withstand pressure. Sometimes the muscles of the elderly patient are quite weakened with age or health related issues and are unable to hold the ball in the socket.
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