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Implantable prostheses designed to be inserted in the marrow cavity of the femoral bone, replacing the femoral head at the hip joint. These prostheses provide a partial substitution of the hip articulation; they typically consist of a metal (e.g., cobalt or chromium alloy) stem inserted in the marrow cavity of the femoral bone, that ends with a neck where a metal ball is attached to serve as the bearing surface. Made of ceramics, polymers (e.g., high-linked polyethylene), or a combination of materials, the prostheses may be intended for use either with or without bone cement. Femoral component hip joint prostheses are used mainly in patients who suffer from osteoarthritis or rheumatoid arthritis, as well as after trauma.
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