膝屈曲状态胫股关节压应力光弹性分析

以胫股关节光弹材料模型模拟膝关节在屈曲０°、１０°、２０°和３０°状态下加载。结果显示胫股间接触面积内髁大于外髁，应力分布外髁大于内髁，最大应力分布于接触部位中心点附近。随着膝关节屈曲角度增加，（１）中心点后移，３０°以内胫股间打滑率内侧为４０．２３％，外侧为４５．９２％；（２）胫骨平台两中心点内移，中心点间距增加；（３）胫股间接触面积减少；（４）应力峰值增加，其增加率远大于面积减少率。实验结果提示膝关节畸形矫正时，要注意恢复胫股间的正常对合与应力分布。

AN PHOTOELASTIC ANALYSIS OF THE STRESS ON TIBIOFEMORAL JOINT IN FLEXED KNEE

Loading on imitative tibiofemoral joint of a flexed knee in 0°,10°,20°and 30°,which is made of photoelastic material. The result shows that the tibiofemoral touching area of internal condyle is larger than external condyle, the stress distrbution of external condyle is stronger than internal condyle, the strongest stress distribution is on the area of touching centre. With the angle of flexed knee joint goes larger, (1) the centre point moves backward, within 30°,the slide rate of internal side is 40.23%, external side is 45.92%;(2)two centre points of tibial plateau move medially,the distance between the centre points is enlarged; (3) tibiofemoral touching area decreases; (4) the peak value of stress increases, the increasing rate is far higher than decreaseing rate in area. The result of the experiment points out that for correcting knee deformity, recovering the normal tibiofemoral para-position and stress distribution should be paid more attention.