摘要
目的本文建立股骨髋关节置换有限元模型,并进行了静力学模拟计算,寻求假体的材料属性对髋关节置换后产生的的影响。方法运用逆向工程与有限元的基本概念和理论,采用医学专用的建模软件mimics读取原始的股骨CT图片的dicom格式,完成股骨三维重建,然后根据股骨髓腔几何解剖状态应用CAD软件设计个性股骨假体。在ansys中对两个模型进行有限元装配,进行接触耦合分析!结果建立了精确的股骨模型和设计了个性假体。利用MIMICS基于灰度值进行赋材质,实现股骨有限元模型材料正确的非均匀及各向异性描述。成功模拟了三种假体材料置换后股骨的应力。结论三种材料中复合材料假体更接近人体生理环境,减弱了假体的应力遮挡,有利于力由假体传到到股骨上。为改进人工髋关节的设计、置换和提高人工髋关节寿命提供了一些有益的依据。研究结果表明这种假体设计和分析方法更为合理、可靠。
Objectives In this paper, the finite element model of femur hip replacement is established, and the corresponding static analysis is carried out to get the effect which the different material properties impacts on hip replacement. Methods based on the basic conception and theory of Reverse engineering and finite element, the DICOM format of original CT data is read by MIMICS to reconstruct the femur 3D model. Based on the geometric anatomical state of hip medulla cavity, the individual femur prosthesis is designed by CAD software. Two models are assembled in the ansys to put up joint coupling analysis! Results the femur model is accurately constructed and the individual prosthesis is designed. The material assignment is applied by MIMICS based on gray scale; the finite element model material of femur is realized in unevenness and anisotropism. The femur stress is simulated after three different materials of the femur hip replacement. Conclusion the prosthesis by CFR/PSF is better in line with human physiological environment than the others, the stress shelter is weaken, it is better for stress to transfer the prosthesis to femur. The research offers some helpful bases for the design, replacement and life of artificial hip joint. And the results reveal that the method is more reasonable and reliable.
出处
《生物骨科材料与临床研究》
CAS
2008年第5期43-46,共4页
Orthopaedic Biomechanics Materials and Clinical Study
基金
福建省高等学校新世纪优秀人才支持计划资助
