Total hip replacement surgery substitutes the damaged bone and cartilage of the joint with polyethylene (a plastic material) or ceramic and metallic components. A hip prosthesis is an artificial articulation, composed of a femoral stem with a head (sphere) and a socket cup (acetabular shell and liner, if any). The femoral stem is made of metal (usually a Titanium or Cobalt Chrome alloy or stainless steel). The head is made of ceramic or metal. The cup is made of 1 or 2 pieces, depending on the procedure: cemented (usually only one component of polyethylene) or cementless (metallic acetabular shell and liner). In the case of metallic acetabular shell, a ceramic or polyethylene liner articulates against the head. All the materials used for hip arthroplasty are highly biocompatible.
With almost 70 years of history, total hip replacement surgery is a very common and safe procedure for the treatment of severe arthritis. The main benefits of a successful total hip replacement are: