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| Research on design of new type of stemless femoral prosthesis |
| GONG Xian-Sheng, WANG Chao |
| State Key Lab of Mechanical Transmissons, Chongqing University, Chongqing 400044, China |
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Abstract This paper investigates the biomechanical performance of a newly designed cervicotrochanteric stemless prosthesis by comparing its stress distribution with that of the traditional stemtype porouscoated anatomic prosthesis. Utilizing CT scanning photographs of real femur, 3D finite element models were set up for the intact, cervicotrochanteric (with two or three fixation screws), and porouscoated anatomic implanted femora with the geometry information of a standardized real femur. Analysis was performed under a loading condition to simulate the singlelegged stance. Von Mises stress distributions of each model were analyzed and compared. The results can be summarized as follows: (1) Von Mises stress in stemless cervicotrochanteric implanted model was higher than that of intact model and porouscoated anatomic implanted model; (2) stressshielding effect of cervicotrochanteric models (with twoor three fixation screws) were eliminated compared to porouscoated anatomic model; (3) no obvious difference in von Mises stress distribution for the cervicotrochanteric implanted model with two or three fixation screws. The cervicotrochanteric femoral prosthesis may reduce stressshielding effect of the proximal femur and achieve more physiological stress distribution on proximal femur than that of the porouscoated anatomic prosthesis.
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Published: 28 October 2005
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一种新型无柄股骨假体的设计研究
通过对比传统有柄股骨假体的应力分布来研究新型无柄股骨假体的生物力学性能。利用真实人体股骨上端的CT扫描图像，建立完整股骨、2个或3个固定螺钉的无柄假体、传统有柄假体的三维有限元模型。模拟人单腿直立的载荷情况，分析和比较每种模型的Von Mises应力分布。研究表明，无柄假体股骨上的Von Mises应力比传统有柄假体和完整股骨上的都要高;与传统有柄假体相比，防止了应力遮挡效应的产生；2个或3个固定螺钉的无柄假体在股骨的Von Mises应力分布上没有明显差别。新型无柄假体可以防止应力遮挡效应，和传统有柄假体相比能够使股骨上的应力分布更加符合实际的生理情况。
关键词：
无柄股骨假体,
有限元分析,
应力遮挡效应,
人工股骨
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