权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

STRESS ANALYSIS OF CEMENTLESS TOTAL HIP REPLACEMENT BY FINITE ELEMENT METHOD USING BOUNDARY FRICTION LAYER AND BOUNDARY ELEMENT METHOD

边界摩擦层和边界元法有限元法对非骨水泥全髋关节置换术的应力分析

基本信息

批准号：
63570697
负责人：
IMURA Shinichi
金额：
$ 1.34万
依托单位：
FUKUI MEDICAL SCHOOL
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

It is required to make biomechanical stability for initial fixation of cementless total hip replacement. Implant-bone interface stresses,bone surface stresses and displacements of implants were analyzed by two-dimensional finite element method using boundary frictionless layer by G essou. Increasing the stem length and the stem thickness result in the reduction of implant-bone interface stress- concentration and the stress-shielding of cortical bones. Considering the curved shape of femoral canal, it is desirable that the distal tip of stem is located in the lower end of fenoral canal isthaus, and that the stem filling ratio in the femoral canal is higher. S tress distributions in the secondary osteoarthritic femoral canal were very different from those in the normal femur. These results indicated that the proximal femoral canal shape was influenced on the biomechanical fixation of cementless stems.To decide the design of the biomechanicaly stable cementless stems, the proxygal femoral canal geometry was analyzed using the Computed Tomography of the hip joints.19 cases(34hips)in normal hip joint group(N group)and 27 cases (44 hips) in osteoarthritic hip joint group(OA group)are examined. In the N group, off set, distance from the below lesser trochanter to the isthmus, canal diameter and area of the isthmus, medial cortex fitted circle was proportional to femoral length, so the proportionality exists in the proxymal femoral sedullary canal. On the other hand,in the OA group, only medial cortex fitted circle was proportional to femoral length. Off set(p<0.05), canal diameter of the isthmus(p<0.02)was significantly smaller and femoral anteversion(p<0.01), angle of neck axis(p<0.01)vas significantly larger in OA group than in N group. It was suggested that the non-cemented femoral prosthesis should have the design and sizes to correspond to the variations of the proxymal femoral canal shapes.

非骨水泥型全髋关节置换术的初始固定要求生物力学稳定。采用Gessou提出的无摩擦边界层二维有限元法分析种植体-骨界面应力、骨表面应力和种植体位移。增加柄长和柄厚可减少种植体-骨界面应力集中和皮质骨的应力遮挡。考虑到股骨髓腔的弯曲形状，股骨柄远端位于股骨髓腔峡部的下端，且股骨柄在股骨髓腔中的填充率较高。继发性骨关节炎股骨管内的应力分布与正常股骨有很大不同。结果表明，股骨近端髓腔的形状对非骨水泥型股骨柄的生物力学固定有影响，为了确定生物力学稳定的非骨水泥型股骨柄的设计，采用髋关节的CT对19例（34髋）正常髋关节（N组）和27例（44髋）骨关节炎髋关节（OA组）的股骨近端髓腔进行了检查。N组的偏心距、小转子下至峡部的距离、峡部、内侧皮质拟合圆的管径和面积与股骨长度成正比，故近端股骨柄管存在正比关系。另一方面，在OA组中，只有内侧皮质拟合圆与股骨长度成正比。OA组峡部的偏心距（p<0.05）、椎管直径（p<0.02）、股骨前倾角（p<0.01）、颈轴角（p<0.01）均显著大于N组。建议非骨水泥型股骨假体的设计和尺寸应与近端股骨管的形状变化相适应。