Much of the orthopedic community now believe that the long-term failure of total hip and knee prostheses is directly or indirectly due to the production of wear particles, particularly polyethylene wear particles which are produced at the articulating interface between the metal component and the high molecular weight plastic component. Therefore, a friction and wear reducing coating on the metal component, which is also biocompatible, should reduce the production of the polyethylene wear particles and dramatically extend hip-implant life. Diamondlike carbon (DLC), with its extreme smoothness, hardness, low coefficient of friction, and biocompatibility is an excellent candidate for such an application. One of the key issues that may limit the utility of DLC in this application is the adhesion of this material to common biomedical alloys. We will show that high adhesion strength between sputter-deposited DLC and a silicon-coated titanium biomedical alloy can be easily achieved.