Schreppers G J, Sauren A A, Huson A
Department of Mechanical Engineering, Eindhoven University of Technology, The Netherlands.
Proc Inst Mech Eng H. 1990;204(1):53-9. doi: 10.1243/PIME_PROC_1990_204_228_02.
An axisymmetric finite element model is applied to the analysis of the force transmission between the tibia-meniscus-femur. The model assumes linear elastic material properties, static loading and sliding contact between the components. The study explores the effects of (a) tibial surface geometry (plane, convex, concave), (b) inclusion of soft layers on the bony components and (c) anisotropic properties of the meniscus. When soft layers are absent, tibial surface geometry is found to affect the total axial stiffness of the model, the radial displacement of the meniscal ring as well as the meniscal share in load transmission. Inclusion of soft layers yields qualitatively the same results for the different geometries, under the understanding that axial stiffness decreases while meniscal radial displacements increase. However, the effect of tibial geometry on the meniscal share in load transmission almost disappears as soon as soft layers are applied, while at the same time a significant increase of this share is observed. Increased circumferential stiffness of the meniscal ring raises this share even more.
一个轴对称有限元模型被应用于分析胫骨-半月板-股骨之间的力传递。该模型假定材料特性为线弹性、静态载荷以及各部件之间的滑动接触。本研究探讨了以下因素的影响：(a) 胫骨表面几何形状（平面、凸面、凹面），(b) 在骨部件上包含软层，以及 (c) 半月板的各向异性特性。当不存在软层时，发现胫骨表面几何形状会影响模型的总轴向刚度、半月板环的径向位移以及半月板在载荷传递中的份额。在理解轴向刚度降低而半月板径向位移增加的情况下，对于不同的几何形状，包含软层会产生定性相同的结果。然而，一旦应用软层，胫骨几何形状对半月板在载荷传递中份额的影响几乎消失，同时观察到该份额显著增加。半月板环周向刚度的增加会进一步提高该份额。
