The purpose of the HJRR is to maintain and improve the care of individuals undergoing joint replacement surgery by providing timely information to their surgeons and the broader orthopaedic community. With the primary outcome measure of time to revision surgery, combined with analysis of confounding factors and mortality monitoring, the HJRR can provide some realistic measure of the success of a given arthroplasty procedure in our community. In addition, the registry can evaluate the relative effectiveness of different prosthetic designs, identify patient variables that may impact implant survival, and provide the tracking mechanism necessary in the event of implant recalls.