Falsig J, Hvid I, Jensen N C
Department of Civil Engineering, Aalborg University Centre, Denmark.
Clin Biomech (Bristol). 1986 May;1(2):71-6. doi: 10.1016/0268-0033(86)90078-1.
A three-dimensional finite element stress analysis was employed to calculate stresses in a distal tibia modelled with three simple total ankle joint replacement tibial components. The bone was modelled as a composite structure consisting of cortical and trabecular bone in which the trabecular bone was either homogeneous with a constant modulus of elasticity or heterogenous with experimentally determined heterogeneity. The results were sensitive to variations in trabecular bone material property distributions, with lower stresses being calculated in the heterogeneous model. An anterolateral application of load, which proved the least favourable, was used in comparing the prosthetic variants. Normal and shear stresses at the trabecular bone-cement interface and supporting trabecular bone were slightly reduced by addition of metal backing to the polyethylene articular surface, and a further reduction to very low values was obtained by addition of a long intramedullary peg bypassing stresses to the cortical bone.
采用三维有限元应力分析方法，对三种简单的全踝关节置换胫骨组件所模拟的胫骨远端应力进行计算。骨骼被建模为一种由皮质骨和松质骨组成的复合结构，其中松质骨要么具有恒定弹性模量的均匀结构，要么具有通过实验确定的非均匀性的非均匀结构。结果对松质骨材料特性分布的变化很敏感，在非均匀模型中计算出的应力较低。在比较假体变体时，采用了最不利的前外侧加载方式。在聚乙烯关节表面添加金属背衬，可使松质骨 - 骨水泥界面和支撑松质骨处的正应力和剪应力略有降低，而添加一根长的髓内钉将应力绕过至皮质骨，则可使应力进一步降低至极低水平。
