【摘要】 目的利用三维有限元分析方法,研究髋臼发育不良患者加深磨锉假体置入部位的髋臼骨床、使臼杯假体内移置入对髋臼假体-骨界面间的应力分布情况的影响。方法选取髋关节发育不良患者的骨盆为实验对象,螺旋CT做全长连续扫描,然后利用计算机仿真技术对CT图像进行三维重建,建立髋关节发育不良骨盆模型。在计算机环境中对重建模型进行髋臼磨锉,臼杯假体不同程度内移植入的模拟手术,利用有限元分析软件SolidWorks对重建模型进行有限元网格化及力学分析。结果臼杯假体的内移使臼杯上缘处获得骨床包容,臼杯接触面积更大,单位面积所受应力相对较少。随内移程度加大,髋臼内壁骨质突破更为明显,使髋臼顶部应力集中及其余部分应力不均愈趋明显。结论髋臼加深磨锉臼杯内移植入有助于改善髋关节发育不良病例行髋关节置换臼杯的骨床包容,但随内移程度的加大,髋臼内壁突破,髋臼面的应力集中,髋臼的应力分布情况明显改变,应尽量减少穿破的程度。更多还原

【Abstract】 Objective Using the three dimensional finite element analysis, the stress distribution in acetabular cup-bone interface in different ranges of cup invagination during total hip replacement(THR) in treating the dysplasia of hip affected was studied. Methods Pelvis in the dysplasia was scanned by CT.Using the computer simulation technology to reconstruct the three- dimensional model of the pelvis for observing the dysplasia of hip from CT scan images. Different ranges of cup invagination in THR in the pelvic model were simulated. Then the pelvis and acetabular cup model were meshed. the mechanics analysis tool in SolidWorks was used to analyze the three- dimensional model, and the stress data in acetabular cup- bone interface was obtained. After the statistical analysis of the experiment result, the different ranges of cup invagination that affected the stress distribution in acetabular cup- bone interface were observed. Results greater contact area and smaller stress per unit area were resulted due to acetabular deepened grinding and cup invagination. With the increasing degree of acetabular deepened grinding, the bone in the acetabular wall broke more obviously, leading to increasing the stress concentration at the top of the acetabulum and uneven stress in the rest. Conclusion Acetabular deepened grinding and cup invagination improve bone bed inclusion of cup during total hip replacement in treating the dysplasia of hip. However, the increasing deepened grinding and perforation of acetabular wall will lead to significant changes of the stress distribution of acetabula and stress concentration. The perforation of acetabular wall should be minimized.更多还原