With the addition of the chair model, the JACE Shoulder chair CMP achieves internal and external rotation as well as elevation (forward flexion).

凭借椅子一样外型，该产品可以实现内部和外部的轮换以及提升（向前弯曲）。

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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.

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。

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