不同角度下护膝紧度对膝关节影响的有限元分析

Finite element analysis of the effect of knee pad tightness on knee joints at different angles

为了探讨不同角度下护膝紧度对膝关节半月板及胫股软骨应力和位移的影响,首先利用MRI获取一位志愿者的人体膝关节数据,构建膝关节有限元模型,通过与前人研究结果对比验证该模型有效。然后在仿真软件中建立屈膝角度分别为0°、30°、60°的膝关节模型并通过改变膝关节外部软组织12个参考点的压力,模拟护膝在不同屈膝角度下对膝关节的压迫。进而以胫股关节软骨、半月板的最大Mises应力和最大位移两个维度作为研究指标,分析不同屈膝角度及不同护膝紧度下半月板和胫股关节的力学特征。结果表明,在应力维度上,不同角度下不同的护膝紧度对半月板和胫股关节的影响趋势不同;在位移维度上,不同角度下紧度越大,对膝关节各部位都呈现较好的防护效果。

To investigate the effects of knee pad tightness on the stress and displacement of meniscus and tibio-femoral cartilage of knee joint at different angles.Firstly,the human knee joint data of a volunteer were obtained by MRI,and the finite element model of knee joint was constructed.The validity of the model was verified by comparing with the re-sults of previous studies.Subsequently,the knee joint models with knee flexion angles of 0°,30°and 60°were established in the simulation software.By changing the pressure of 12 reference points of the external soft tissue of the knee joint,the compression of the knee joint under different knee flexion angles was simulated.Then,taking the maximum Mises stress and maximum displacement of the tibiofemoral joint cartilage and meniscus as the research indicators,the mechanical char-acteristics of the meniscus and tibiofemoral joint under different knee flexion angles and different knee pad tightness were analyzed.The results show that in the stress dimension,the influence of different knee tightness on the meniscus and tibio-femoral joint is different under different angles.In the displacement dimension,the greater the tightness at different angles,the better the protective effect on all parts of the knee joint.