A bilateral trial design, in which 1 knee was replaced with a mobile-bearing prosthesis and the other with a fixed-bearing prosthesis, affords the best comparison as far as match-pairing is concerned.

• 双边试验要求，1侧患膝采用活动负载假体置换，而另一侧患膝则采用固定负载假体置换，这被认为能够进行最好的配对比较。