股骨假体结构与材料性能分析及多目标优化

Multi-objective optimization of femoral prosthesis based on analysis of structure and material properties

摘要:

为依据患者个体信息获得优选的假体结构及假体材料，利用患者CT体数据集提取股骨内外轮廓线，并通过三维建模软件分别获得股骨和假体模型，对股骨和假体进行虚拟装配，通过力学计算得到最优股骨假体结构模型，利用有限元分析方法获得股骨假体额定载荷、疲劳寿命、应力遮挡率、最大变形量，依据模糊物元分析方法实现多目标优化设计，最终获得最优球头和假体柄材料匹配模型. 将该方法应用于优选实例，结果表明：依据专门患者CT图像，通过完整的优选流程后，确定出最优假体结构为椭球形球头和定制式假体柄组合，最优材料匹配方案为碳纤维增强的聚醚酮复合材料球头和锆铌合金材料假体柄匹配方案. 该方法为股骨假体的优选提供了有效参考.

Abstract:

The aim of this paper is to optimize femoral prosthesis structure and material based on special patient information. Firstly, femoral external and internal contour are extracted from CT data. Femur model and prosthesis model are got respectively and assembled by using 3D reconstruction software, and then the optimized prosthesis structure is developed based on biomechanical analysis results. Secondly, the prosthesis rated load, the life of prosthesis, stress shielding and deformation are determined by the finite element analysis results, and the optimized material matching model is developed based on multi-objective optimization results that are resolved by fuzzy matter-element method. Finally, this prosthesis design method is utilized to a special patient. The optimized structure for this patient is the spheroidic femoral head and individual prosthesis stem, and the optimized materials are the carbon fiber enhanced pek composite for femoral head and Zr-Nb alloy for prosthesis stem.