肱骨内植物材料选择及预紧力影响的参数化研究  

Parametric study on material selection and effect of pre-tightening force for humerus implants

作　　者：董双鹏[1] 王成焘[2] 齐宝芬[1] 张述[1] 焦永哲[1] 张路[1] 陈长胜 

机构地区：[1]国家食品药品监督管理局天津医疗器械质量监督检验中心,天津300384 [2]上海交通大学机械与动力工程学院,上海200240 [3]常州奥斯迈医疗器械有限公司,江苏常州213022

出　　处：《中国骨与关节外科》2014年第1期35-39,共5页Chinese Journal of Bone and Joint Surgery

基　　金：国家科技支撑计划项目(2012BAI22B01)

摘　　要：背景:目前,关于肱骨及接骨板的生物力学研究较多,但甚少将两者组合为一个骨折固定模型并将材料及预紧力作为参数进行研究。目的:通过带接骨板的肱骨骨折有限元模型的生物力学仿真,比较不同接骨板和螺钉材料、预紧力对举重过程中接骨板及螺钉失效可能性的影响,以及对骨折应力遮挡效率的影响。方法:利用肱骨点云数据和接骨板及螺钉几何数据进行装配,得到带接骨板的肱骨骨折有限元模型,将举重动作逆向动力学仿真得到的关节力和肌肉力作为有限元仿真的载荷边界条件。采用相同的有限元模型进行参数化研究,比较不同接骨板和螺钉材料及预紧力对接骨板、螺钉、骨折缝及其周围肱骨应力变化的影响。结果:相同预紧力下,采用不锈钢材料接骨板和螺钉的应力大于钛合金和钛材料,即采用不锈钢材料接骨板和螺钉失效的危险性大于钛合金和钛材料;采用不锈钢材料时肱骨的应力遮挡率大于钛合金和钛材料;采用相同材料时,增加预紧力会导致接骨板和螺钉的应力增加,但会减小肱骨的应力遮挡率。结论:接骨板和螺钉的材料属性及预紧力大小等因素均对接骨板、螺钉以及骨的应力分布有一定影响。本文建立的分析方法同样适用于其它部位骨折固定的应力分析。Background：Now there are many biomechanical researches on humerus or humeral bone plate. However, there are few re-ports on humerus bone-plate system using material properties and pre-tightening force as parameters. Objective： To evaluate the effect of bone plate material and pre-tightening force on stress distributing of bone and plate through biomechanical simulation of the finite element model of fracture humerus bone with plate. Methods：The finite element model of humerus fracture was set up by using point cloud data of humerus and geometry data of bone plate and screw. The joint force and muscle force deriving from inverse dynamics analysis of weight lifting activity were taken as boundary conditions. On the finite element model, the stress distribution changes of bone plate, bone screw, fracture seam and humerus were compared between different materials and pre-tightening forces. Results：Under the same pre-tightening force, the stress of stainless steel was larger than Ti alloy and Titanium. The stess-shielding of stainless steel was larger than Ti alloy and Titanium. When the same material was applied, increased pre-tight-ening force could induce the increase of stress of bone plate and screw and decrease of stess-shielding. Conclusions： The material and pre-tightening force of bone plate and screw will affect on the stress distribution of bone plate, bone screw and bone itself. This method can be used for stress analysis of other bone fractures.

关 键 词：肱骨骨折 有限元分析 逆向动力学仿真 参数化 

分 类 号：R687.3[医药卫生—骨科学]