滚动式人工膝关节设计

Rolling Friction: A Desing of Artificial Knee Joint

针对人工关节中超高分子量聚乙烯(UHMWPE)磨粒导致的骨吸收、骨溶解及由此引起的假体远期松动问题,提出一种滚动式膝关节假体设计。这种膝关节假体利用金属—陶瓷滚动摩擦副代替UHMWPE-金属滑动摩擦副,通过降低膝关节伸屈运动时的摩擦阻力和假体—骨界面间的应力,从而减少磨屑产生,降低假体远期松动的可能性。

Resorption and osteolysis of periimplant bones resulting from the wear debris of artificial joint will cause long-term loosening. A new type of rolling knee artificial joint without UHMWPE based on the mechanics of rolling friction is designed for alleviating this problem. Because of low friction force, the resistance of extension and flexion is reduced strikingly and the stress on the interface between prosthesis and bone is reduced evidently. In addition, the bio-toxicity caused by the wear debris of UHMWPE will not occur absolutely. In consequence, the rolling artificial joint can prevent the trend of long-term loosening of the prosthesis efficiently.