Hip replacement is a surgery performed to replace parts of a diseased hip joint with a prosthesis. The goal of hip replacement is to eliminate pain and enable you to return to your normal activities.
The hip joint is a ball and socket joint. The ball is the head of the femur (thighbone) that fits in the acetabulum (the hip socket). Tendons, muscles, and ligaments hold the joint in place. Articular cartilage covers the acetabulum and the femoral head.