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中文摘要：
选取4种不同形态的非骨水泥股骨假体柄为研究对象,通过有限元方法,分析和比较步态和爬楼梯2种载荷下股骨柄与股骨间的相对微动情况.结果发现,假体柄形状的不同对初期稳定性有一定影响,特别是Ribbed解剖型假体柄与其他3种直柄非解剖型假体柄的微动分布截然不同,其近端的微动小于远端;但其微动值均小于5μm,远小于导致骨纤维化的临界微动值,这一数据为假体临床使用时的稳定性提供了基础.
英文摘要：
Four cementless stems of different shapes frequently used in China were chosen. The micromotions of the interfaces between femoral stem and femur for these stems under the gait and upstairs loadings were quantified using finite element method. The results show that different shapes have some influences on the primary stability. Especially for the ribbed anatomic femoral stem, its mieromotion in the proximal is less than that in the distal, which is opposite from the other three straight shank prostheses. Meanwhile the micromotions for the four stems are less than 5 μm, which is much less than the threshold value that would cause the formation of a fibrous tissue layer at the bone-implant interface. These values provide a good foundation for the good primary stabilities of the stems in clinics.
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