Biomaterials are used in many areas of medicine, particularly in surgery and d- tistry. In orthopedic surgery, total hip arthroplasty has been extremely successful, and has been called the operation of the 20th century . Total hip arthroplasty is r- tinely performed every day in most orthopedic departments. Over the last decades, many efforts have been made to better integrate the components within the recipient bones, to decrease the friction at the prosthetic interface, and to minimize wear. Minimally invasive procedures have been developed, and various designs are inte- ed to preserve as...