In Chapter 8 a general overview of the results is given with the answers to the questions as described in section 2.1. Although the thickness of the polyethylene of the SKI prosthesis was far below the recommended eight to ten millimeters, the locking mechanism of the tibial insert with a screw had a poor design and the alignment of the prosthesis with the external guidance instruments was far from optimal, the cumulative survival rate of this prosthesis is high and it provides a durable decrease in pain as well as a significant improvement in range of motion, stability, alignment and patient function. Had the fixation mechanism of the PE insert been better, the survival rate might have been even higher.