摘要
目的研究人工髋关节不同形状股骨头对髋臼变形及应力分布的影响。方法建立不同形状(球形、椭球形、蚶线球体)股骨头的人工髋关节三维有限元模型,模拟人体步态过程中的受力情况,计算并分析髋臼变形、应力以及股骨头应力的分布情况。结果在3种形状的股骨头中,球形股骨头对髋臼产生的变形量最大,蚶线球体股骨头次之,椭球形股骨头最小;蚶线球体股骨头产生的中心应力最高,球形股骨头次之,椭球形股骨头最小。结论在减少髋臼变形降低应力分布方面,椭球形股骨头比球形股骨头和蚶线球体股骨头有着明显的优势,这对于人工髋关节的优化设计具有一定的指导作用。
ObjectiveTo study the influence of femoral head shape on acetabular deformation and the stress of artificial hip joint. Methods Three 3-D finite element models of hip joint with different femoral head shapes were established, the acetabular deformation and stress were computed and analyzed by applying constraint and forces during normal gait. Results The acetabular deformation contacted with the spherical femoral head was maximal, and that contacted with the ellipsoid was minimal. The conchoid shape femoral head had the lar- gest central stress among 3 femoral heads, the spherical femoral head came second, and the ellipsoid one was minimal. Conclusion The femoral head of ellipsoid shape has an advantage over the sphere and conchoid femoral heads in reducing acetabular deformation and stress distribution, which would provide a guide for the de- sign of artificial hip ioint.
出处
《航天医学与医学工程》
CAS
CSCD
北大核心
2010年第5期367-370,共4页
Space Medicine & Medical Engineering
基金
江苏省自然科学基金创新学者攀登项目(BK2008005)
关键词
人工髋关节
股骨头形状
髋臼变形
应力分布
有限元分析
artificial hip joint
femoral head shape
acetabular deformation
stress distribution
finite elementanalysis
