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Micromechanical modeling of the cement-bone interface: the effect of friction morphology and material properties on the micromechanical response

机译：骨水泥界面的微机械建模：摩擦形态和材料性能对微机械响应的影响

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In order to gain insight into the micro-mechanical behavior of the cement-bone interface, the effect of parametric variations of frictional, morphological and material properties on the mechanical response of the cement-bone interface were analyzed using a finite element approach. Finite element models of a cement-bone interface specimen were created from micro-computed tomography data of a physical specimen that was sectioned from an in vitro cemented total hip arthroplasty. In five models the friction coefficient was varied (μ= 0.0; 0.3; 0.7; 1.0 and 3.0), while in one model an ideally bonded interface was assumed. In two models cement interface gaps and an optimal cement penetration were simulated. Finally, the effect of bone cement stiffness variations was simulated (2.0 and 2.5 GPa, relative to the default 3.0 GPa). All models were loaded for a cycle of fully reversible tension-compression. From the simulated stress-displacement curves the interface deformation, stiffness and hysteresis were calculated. The results indicate that in the current model the mechanical properties of the cement-bone interface were caused by frictional phenomena at the shape-closed interlock rather than by adhesive properties of the cement. Our findings furthermore show that in our model maximizing cement penetration improved the micromechanical response of the cement-bone interface stiffness, while interface gaps had a detrimental effect. Relative to the frictional and morphological variations, variations in the cement stiffness had only a modest effect on the micromechanical behavior of the cement-bone interface. The current study provides information that may help to better understand the load transfer mechanisms taking place at the cement-bone interface.
机译：为了深入了解水泥骨界面的微机械性能，使用有限元方法分析了摩擦，形态和材料特性的参数变化对水泥骨界面机械响应的影响。水泥-骨界面标本的有限元模型是根据物理标本的微计算机断层扫描数据创建的，该数据是从体外胶合全髋关节置换术中切出的。在五个模型中，摩擦系数发生了变化（μ= 0.0； 0.3； 0.7； 1.0和3.0），而在一个模型中，假定了理想的粘结界面。在两个模型中，模拟了水泥界面间隙和最佳水泥渗透度。最后，模拟了骨水泥刚度变化的影响（相对于默认的3.0 GPa为2.0和2.5 GPa）。加载所有模型进行完全可逆的拉伸压缩循环。从模拟的应力-位移曲线可以计算出界面变形，刚度和滞后。结果表明，在当前模型中，骨水泥界面的机械性能是由形状闭合互锁处的摩擦现象引起的，而不是由骨水泥的粘合性能引起的。我们的发现进一步表明，在我们的模型中，最大程度地渗透水泥可改善水泥骨界面刚度的微机械响应，而界面间隙则具有不利影响。相对于摩擦和形态变化，水泥刚度的变化仅对水泥骨界面的微机械性能有中等影响。当前的研究提供的信息可能有助于更好地了解水泥骨界面发生的载荷传递机制。

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