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Biomechanical Study of Stability and Wear of Total Hip Prosthesis under Dynamic Gait Load.

动态步态负荷下全髋关节假体稳定性和磨损的生物力学研究。

基本信息

批准号：
09470311
负责人：
OMORI Hironori
金额：
$ 4.35万
依托单位：
Fukui Medical University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Purpose There were few reports of stress analysis in total hip arthroplasty (THA) under dynamic load based on human gait. In this study, we calculated dynamic resultant forces of the hip based on gait analysis of a patient undergone THA and performed serial analysis of polyethylene wear under this dynamic load using a nonlinear 3-dimensional finite element method (FEM).Materials and Methods 1) We performed 3-dimensional computer simulation of a normal human gait using the SIMGAIT and ADAMS software based on data taken from gait analysis using a VICON, and calculated the dynamic resultant forces of the hip. These values were compared with those in the previous in vivo studies using a telemetric prosthesis. 2) We calculated dynamic resultant forces of the hip of a patient before revision THA by the same method. These dynamic forces during one gait cycle applied on the 3-dimensional FEM model of the acetabular component that were precisely constructed using the CT and radiograph of this p … More atient. The amount and rate of volumetric polyethylene wear were calculated using a nonlinear 3-dimensional FEM software (ADINA), based on the number of gait cycles per year measured by a pedometer that the patient had kept throughout a year. The total amount and rate of volumetric wear at revision surgery by the FEM analysis were compared with those in the retrieval study.Results 1) The magnitude and direction of our dynamic resultant forces of the normal human gait were consistent with those in the previous in vivo studies. 2) Our results calculated by FEM analysis were very similar to those directly measured from the retrieved acetabular component in total amount and rate of volumetric wear.Discussion The results of this study suggested that our method would be useful to predict the serial wear performances of total hip prosthesis. Although our method did not take the condition of hydrodynamic lubrication and initial polyethylene wear into consideration, it was anticipated that this method could predict more true and more detailed wear performances in vivo by modifying based on the data of many cases. Less

目的对全髋关节置换术中基于人体步态的动态负荷应力分析报道较少。在这项研究中，我们基于对一位THA患者的步态分析计算了髋关节的动态合力，并使用非线性三维有限元法（FEM）对这种动态载荷下的聚乙烯磨损进行了一系列分析。1)基于VICON步态分析数据，利用SIMGAIT和ADAMS软件对人体正常步态进行三维计算机模拟，计算髋关节动态合力。这些数值与先前使用遥测假体的体内研究结果进行了比较。2)我们用同样的方法计算了THA翻修前患者髋关节的动态合力。这些动态力在一个步态周期内应用于髋臼部件的三维有限元模型，该模型是使用该患者的CT和x线片精确构建的。使用非线性三维有限元软件（ADINA）计算体积聚乙烯磨损的数量和速率，基于患者全年使用计步器测量的每年步态周期数。通过有限元分析比较了修复手术时的体积磨损总量和磨损率与修复研究时的体积磨损率。结果1)正常人体步态动态合力的大小和方向与之前的体内研究结果一致。2)用有限元法计算的结果与直接从取出的髋臼部件测量的结果在总量和体积磨损率上非常相似。本研究结果提示我们的方法可用于预测全髋关节假体的连续磨损性能。虽然我们的方法没有考虑流体动力润滑和聚乙烯初始磨损的条件，但可以预期，通过对多例数据的修正，该方法可以预测更真实、更详细的体内磨损性能。少