髋臼缺损有限元模型的建立及力学分析  

Modeling and finite element analysis of acetabular defects

作　　者：马文辉[1] 张学敏 王继芳[3] 

机构地区：[1]解放军白求恩国际和平医院骨科,河北省石家庄市050082 [2]河北省国防建医院,河北省石家庄市050081 [3]解放军总医院骨科,北京市100853

出　　处：《中国组织工程研究与临床康复》2010年第43期8004-8007,共4页Journal of Clinical Rehabilitative Tissue Engineering Research

摘　　要：背景:目前已设计了多种假体可用于伴有骨缺损的髋臼翻修手术,重建髋臼骨缺损对于翻修手术的成败至关重要。为了更好地评价翻修假体的设计,有必要对髋臼翻修前后的应力分布进行详细了解。目的:建立髋臼缺损的有限元模型,研究其在正常步态周期内的应力变化。方法:取正常男性完整骨盆标本,获取髋臼区空间结构三维坐标数据,建立人正常及缺损髋臼的有限元模型,应用有限元分析公式计算两种类型髋臼在正常步态周期内的应力变化规律。结果与结论:研究证实在正常步态周期内,正常髋臼的最高应力位于髋臼外上部,并且取决于髋关节力的大小和方向。髋臼区应力分解为指向髋臼外上部的主要部分和指向耻骨支撑区的次要部分。而在髋臼缺损模型,负荷传导的部位从髋臼缘的前上方变到后上方和耻骨支撑区。结果表明有限元分析是研究缺损髋臼应力变化及其翻修假体设计的有效方法。BACKGROUND：Alternative components provided several advantages for acetabular revision,but it is paramount to the success of the revision surgery to reconstruct acetabulum.It is necessary to analyze stress distribution before acetabular revision to better prosthesis design.OBJECTIVE：To establish and explore the finite element model of acetabulum in the presence of bone loss.METHODS：The finite-element models of normal acetabulum and the acetabulum with bone loss were established to calculate the stresses during a normal gait cycle with use of the finite-element analysis.RESULTS AND CONCLUSION：Results of finite-element analysis demonstrated that the peak stress was tested at the superolateral rim.The study indicated increased stresses with an increased hip force and orientation.The stress of cup consisted of a main superolateral stress and a minor stress pointing to pubis.While the transferring direction of stress changed from anterosuperior rim to posterosuperior rim in acetabulum in the presence of bone loss.This study demonstrated that this finite-element technique seemed to be a viable means of exploring stress of acetabulum in the presence of bone loss and improving the design of component for acetabular revision.

关 键 词：髋臼翻修 有限元模型 有限元分析 力学分析 数字化骨科 

分 类 号：R318[医药卫生—生物医学工程]