The hip is a ball-and-socket joint. Hip replacement, also known as hip arthroplasty, is an orthopedic surgical procedure replacing the lining of the acetabulum (socket) and the femoral head (ball) with a prosthesis made of metal alloys, polyethylene (plastic), or ceramic. In some instances, it is necessary to replace the upper portion of the femur as well.

Hip replacement is the second most common joint replacement surgery in the United States and has a success rate of more than 90%. Individuals who elect to have a hip replacement report experiencing severe, debilitating pain that limits activity levels significantly prior to surgery.

Further Reading:

American Academy of Orthopaedic Surgeons: Hip Replacement

Stryker: Hip Replacement Systems