[Patellar resurfacing in total knee arthroplasty, current state of the controversy].

This article reviews the current controversy of resurfacing the patella in total knee arthroplasty. Up-to-date knowledge of experimental and biomechanical studies as well as the different types of implants and specifics of the patella preparation are described in detail. The author furthermore discusses the relevant clinical studies dealing with patellar resurfacing and tries to guide the reader in evaluating the results. Finally is summarized why the indication for resurfacing the patella is so controversial and how a differentiated indication for resurfacing the patella could be specified.