In prosthesis used in this study includes a tibial plateau with a central stem with stabilizing wings, the bottom surface of which is recessed by about 1 mm, so that a pocket is formed surrounded by a lip that provides for an even thickness of the cement layer beneath the tibial plateau. This assures that the cement is pressed down into the spongiosa during fixation of the implant. This design doubles the penetration of the cement compared with prostheses without a depressed baseplate. The company behind this design has had a successful follow-up of this system for more than 15 years. A good cement/implant interphase lessens the risk of penetration of debris into the interphase and thus reduces the risk for the development of osteolysis and aseptic loosening of the implant.