The individual components of a total hip replacement. The components merged into an implant.The implant as it fits into the hip.Hip replacement implants come in all shapes and sizes and materials and brands. Such joint replacement orthopaedic surgery is generally conducted to relieve arthritis pain or in some hip fractures. A total hip replacement (total hip arthroplasty) consists of replacing both the acetabulum and the femoral head while hemi arthroplasty generally only replaces the femoral head.