During a total hip replacement surgery, damaged bone, tissue and cartilage is removed and replaced with artificial materials. I will remove the damaged femoral head and a cobalt chrome or titanium stem is placed into the top part of the femur. The stem can be placed with or without cement for fixation. The quality of the bone, the patient’s age and the size of the canal of the femur will be considered before the technique is decided on. A ball made of either metal or ceramic material is then placed on the stem to replace the femoral head. Any damaged cartilage is removed from the surface of the socket, before it is replaced with a metal socket. This socket is placed as a pressfit component without cement for fixation. A plastic or polyethilene liner seperates the ball and cup. This allows for smooth movement in the joint.