In total hip arthroplasty, the damaged cartilage and bone are removed and replaced with prostheses.
The damaged femoral head is removed and replaced with a metal swab placed in the femoral lumen. The fixation of the swing can be done with the use of bone cement or without bone cement ("press fit" technique). A metal or ceramic sphere is placed on top of the swab. This ball replaces the removed femoral head.
The damaged acetabular cartilage is removed and replaced with a metal prosthesis. Sometimes screws or bone cement can be used to secure it. A plastic, ceramic or metal insert is placed between the ball and the new acetabulum to ensure smooth movement.