| Since registration of knee prostheses started in 1994, a total of 21 535 TKA was registered by the year 2004. The registration completeness was good. The revision burden in knee arthroplasty was 9%. There were no significant differences between total knees with or without patellar resurfacing. The survival of unicondylar arthroplasties was significantly lower than for the total knees. Furthermore, the last generation unicondylar prostheses has so far not proved to be superior to the older designs in our material.
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