Hip replacement is a common orthopedic surgical procedure performed to relieve pain and restore mobility to a damaged hip joint, typically for patients with arthritis or a hip injury. Diseased or damaged portions of the hip ball and socket joint are replaced by prostheses made of metal, ceramic, plastic, or combinations of these materials. Metal-on-metal (MoM) hip replacement implants use ball and socket components that are both made of cobalt or chromium metal, or titanium. The ball fits into and glides against the surface of the socket to imitate the function of the hip joint.
Hip replacement surgery is mostly successful, and hip implants are made to last 15 or more years before replacement is required. There are risks of several complications that can occur, however; as with any type of surgery. Complications that can occur include infection, dislocation of the ball implant from the socket, and implant loosening or other wear and tear over time requiring another hip replacement surgery.