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首页> 外文期刊>JSME International Journal. Series C, Mechanical Systems, Machine Elements and Manufacturing >Design of Composite Hip Prostheses Considering the Long-Term Behavior of the Femur
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Design of Composite Hip Prostheses Considering the Long-Term Behavior of the Femur

机译：考虑股骨长期行为的复合型髋关节假体设计

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摘要

A design method for the hip prosthesis is proposed which can alleviate problems associated with stress shielding, proximal loosening and the high stress of bone-implant interfaces after total hip replacement. The stress shielding which may lead to bone resorption, can cause a loosening of the stem and a fracture of femoral bone. Generally the composites were more suitable for hip prosthesis material in the long-term stability than metallic alloy because design cases of composite materials produced less stress shielding than titanium alloy. A bone remodeling algorithm was implemented in a nonlinear finite element program to predict the long-term performance of the hip prosthesis. The three neck shapes and three cross sections of composite hip were examined. It was found that the stress concentration in the distal region of the titanium stem which may cause the patient's thigh pains was reduced using composite material. The head neck shape was closely related with the cortical bone resorption and the cancellous bone apposition at proximal region whereas the cross-section was closely related with the relative micromotion between interfaces. The convex head neck type with the quadrangle cross-section produced less subsidence at proximal region on the medial side than the others. For all composite material cases, the cancellous bone apposition occurred at partial interfaces, which may result in a stable bio-fixation. The design performances of the convex neck head type with the hexagonal cross-section designed to insure the long-term stability were found to be more suitable than the others.
机译：提出了一种髋关节假体的设计方法，该方法可以缓解与全髋关节置换术后应力屏蔽，近端松动以及骨-植入物界面的高应力有关的问题。可能导致骨骼吸收的应力屏蔽会导致茎杆松动和股骨骨折。通常，在长期稳定性方面，复合材料比金属合金更适合髋关节假体材料，因为复合材料的设计案例所产生的应力屏蔽性比钛合金要小。在非线性有限元程序中实现了骨骼重塑算法，以预测髋关节假体的长期性能。检查了复合髋关节的三个颈部形状和三个横截面。发现使用复合材料降低了可能导致患者大腿疼痛的钛杆远端区域中的应力集中。头颈部的形状与皮质骨吸收和近端松质骨的位置密切相关，而横截面与界面之间的相对微动密切相关。具有四边形横截面的凸头颈部型在内侧的近端区域产生的沉陷要比其他类型少。对于所有复合材料情况，松质骨并置均发生在部分界面处，这可能导致稳定的生物固定。发现具有六边形横截面以确保长期稳定性的凸颈头型的设计性能比其他类型更合适。

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