Huang Shyh-Chour
National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan, R.O.C.
Biomed Mater Eng. 2017;28(5):567-578. doi: 10.3233/BME-171688.
The knee joint is one of the more important parts in the human body. Its continuous involvement in the human movement makes it prone to breakage. Due to small contact area, the contact pressure is quite large in this joint. Therefore, the understanding of stresses behavior in knee joint contact is a necessity. In this study, we investigated the stresses behavior in the tibial insert by FEA. A two-dimensional FE model representing the knee joint contact mechanism was created. In the elastic simulation, the contact pressure dropped by 0.2% when the coefficient of friction (CoF) was added. While in the plastic simulation it rose by 12.06%. The average contact pressure fell by 36.42% of the inclusion of plasticity. The CoF lowered the Tresca stress by 0.16% and 12.37% in the elastic and plastic simulation, respectively. Meanwhile, the inclusion of plasticity decreased the average Tresca stress by 74.25%. The CoF, in the elastic simulation, decreased the compressive and tensile stress by 3.29% and 12.46%, respectively. Conversely, in the plastic simulation the compressive stress and tensile rose by 12.01% and 8.20%, respectively. Meanwhile, the inclusion of plasticity caused the compressive stress to decrease by 70.50% and tensile stress to increase by 72.06%.
膝关节是人体较为重要的部位之一。它持续参与人体运动，因而容易受损。由于接触面积小，该关节处的接触压力相当大。因此，了解膝关节接触中的应力行为很有必要。在本研究中，我们通过有限元分析（FEA）研究了胫骨假体中的应力行为。创建了一个代表膝关节接触机制的二维有限元模型。在弹性模拟中，添加摩擦系数（CoF）时接触压力下降了0.2%。而在塑性模拟中，接触压力上升了12.06%。考虑塑性时平均接触压力下降了36.42%。在弹性和塑性模拟中，CoF分别使特雷斯卡应力降低了0.16%和12.37%。同时，考虑塑性使平均特雷斯卡应力降低了74.25%。在弹性模拟中，CoF使压缩应力和拉伸应力分别降低了3.29%和12.46%。相反，在塑性模拟中，压缩应力和拉伸应力分别上升了12.01%和8.20%。同时，考虑塑性使压缩应力降低了70.50%，使拉伸应力增加了72.06%。
