髋臼内壁内移截骨全髋置换治疗成人髋臼发育不良的有限元分析及临床意义

目的 通过计算机辅助设计有限元分析,找寻髋臼内壁截骨的合适内移范围,为临床工作提供理论依据.方法 利用SolidWorks 2005软件,建立髋臼发育不良骨盆的三维模型,模拟髋臼内壁内移截骨术式,使髋臼内壁骨从未完全陷入盆腔内保持2 mm骨性接触处开始,逐渐内移至完全陷入盆腔内7 mm处,每隔1 mm为1个实验组,分成10个实验组.每组髋臼人为划成4个象限,分别对各组假体臼-骨界面间进行计算机模拟对比力学实验分析,测量出髋臼假体-骨界面间的Mises应力及剪切应力值,找寻出应力分布较为均匀的实验组.结果 Mises应力及剪切应力均有1个象限内的值较大,通过2次统计学分析计算,得出实验结果.结论 当髋臼内壁内移至未完全陷入盆腔内1 mm处到完全陷入盆腔内1 mm处的范围内,髋臼假体-骨界面间的应力分布均匀,最佳位置在完全陷入盆腔内1 mm处.

Finite Element Analysis of Acetabular Impacting Total Hip Replacement for Acetabular Dysplasia in Adults

Objective To seek the appropriate scope of the medial acetabular osteotomy in acetabular impacting total hip replacement by finite element analysis and to provide a theoretical basis for clinical work.Methods On the SolideWorks calculation platform,the pelvic model of acetabular dysplasia was reconstructed.The medial displacement of the acetabular wall ranged from-2 to +7 millimeter.Ten groups were divided by displacing the acetabular wall medially every 1 millimeter.The biomechanic analysis for the effects of the load distribution around the acetabula from the different medial displacements was carried out,in order to find out which position had the best load distribution and defined the safest scope of the medial displacement of acetabular wall.Results There was always a highest Mises and shear loading numerical value area in one of the quadrants.The obtained laboratorial data were analyzed through t-students statistical calculation.Conclusion The medial displacement of acetabular wall from-1 to +1 millimeter is defined as the safe scope,especially at +1 millimitre displacement position.