股骨假体屈曲会在屈膝过程中遮挡股骨前关节面，这对于术后评价屈膝功能有重要意义。
Femoral component with slight flexion might prevent anterior femoral notching in bowing knees. It is important to evaluate the femoral bowing preoperatively, so as to prevent femoral notching.
提倡股骨和胫骨假体外旋以改善髌骨轨迹和屈曲间隙平衡，在胫骨和股骨假体间保持一致性。当对称性的股骨假体外旋时，可以产生股骨前外侧切割现象。
External rotation of the femoral and tibial components has been advocated to improve patella tracking and flexion gap balance while maintaining congruency between the tibial and femoral components.
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