摘要
目的 通过有限元分析探讨全髋关节置换术后髋臼杯位置对髋关节发育不良髋臼侧应力的影响.方法 获取一名36岁女性髋关节发育不良患者的CT数据.采用三维有限元分析,建立不同臼杯位置的三维有限元模型.每个模型以旋转中心不同分为解剖旋转中心组、高旋转中心组、外移旋转中心组、外上旋转中心组.通过ANSYS软件对模型施加载荷,模拟站立位(588 N垂直应力)和行走状态(X=325 N、Y=-195 N、Z=1 462.5 N)臼杯周围应力.在两种不同的负荷条件下,对8个模型中每个区域的臼杯-骨界面的相对位移及应力进行定量分析.结果 站立位,臼杯覆盖率90％时,臼杯-骨界面相对位移:解剖旋转中心组为45.16 μm、高旋转中心组为47.57 μm、外移旋转中心组为77.27 μm、外上旋转中心组为96.13 μm,髋臼应力:解剖旋转中心组为9.07 MPa、高旋转中心组为11.23 MPa、外移旋转中心组为10.88 MPa、外上旋转中心组为17.75 MPa;臼杯覆盖率70％时,臼杯-骨界面相对位移分别为64.15、65.71、104.10、144.53 μm,髋臼应力分别为9.30、11.31、13.98、21.45 MPa.行走状态,臼杯覆盖率90％时,臼杯-骨界面相对位移分别为189.67、173.55、311.03、572.93µm,髋臼应力分别为39.92、37.33、47.92、71.94 MPa;臼杯覆盖率70％时,臼杯-骨界面相对位移分别为239.09、248.83、381.84、1 1059 000.00 μm,髋臼应力分别为40.62、58.42、56.26、3 606.30 MPa.结论 臼杯覆盖率70％和90％时,解剖旋转中心和高旋转中心模型臼杯-骨接触面间的相对位移均较低,且应力集中的情况较少.
Abstract
Objective To investigate the effects of acetabular cup positions on the acetabular side stress in hip dysplasia after total hip arthroplasty(THA)using finite element analysis.Methods Data were obtained from a 36-year-old female patient with developmental dysplasia of the hip.Three-dimensional finite element models were established for different acetabular cup po-sitions using finite element analysis.Each model was categorized based on the center of rotation into four groups:anatomical rota-tion center,high rotation center,lateralized rotation center,superior-lateral rotation center.ANSYS software applied loads to the model to simulate the stress around the acetabulum in standing(588 N vertical stress)and walking conditions(X=325 N,Y=-195 N,Z=1 462.5 N).Quantitative analyses of the relative displacement and stress at the acetabular-bone interface were conducted for each region under the two different loading conditions in all eight models.Results In the standing position with a cup coverage of 90％,the relative displacement at the acetabular-bone interface was:45.16 μm for the anatomical rotation center group,47.57 µm for the high rotation center group,77.27 µm for the lateralized rotation center group,and 96.13 μm for the superior-lateral ro-tation center group.Acetabular stress values were 9.07 MPa for the anatomical rotation center group,11.23 MPa for the high rota-tion center group,10.88 MPa for the lateralized rotation center group,and 17.75 MPa for the superior-lateral rotation center group.With a cup coverage of 70％,the relative displacements were 64.15,65.71,104.10,and 144.53 μm for the respective groups.The corresponding stresses were 9.30,11.31,13.98,and 21.45 MPa.In the walking state with a cup coverage of 90％,the relative dis-placements at the acetabular-bone interface were 189.67 μm for the anatomical rotation center group,173.55 µm for the high rota-tion center group 311.03 μm for the lateralized rotation center group,and 572.93 μm for the superior-lateral rotation center group.The stresses were 39.92,37.33,47.92,and 71.94 MPa,respectively.With a cup coverage of 70％,the relative displacements were 239.09 μm for the anatomical rotation center group,248.83 µm for the high rotation center group,381.84 µm for the lateralized ro-tation center group,and 1105.90 pm for the superior-lateral rotation center group.The corresponding stresses were 40.62,58.42,56.26,and 3,606.30 MPa.Conclusion With cup coverage at 70％and 90％,the high rotation center and anatomical rotation cen-ter exhibited lower and less frequent relative displacements at the acetabular-bone contact surface.
维普
万方数据