渐变形面膝关节假体设计及接触应力分析

发布时间：2018-03-07 09:40

本文选题：膝关节　切入点：假体设计　出处：《航天医学与医学工程》2017年01期 　论文类型：期刊论文

【摘要】：目的研究膝关节假体形面轮廓对假体关节面间接触应力的影响。方法基于MRI(magnetic resonance imaging)图像采集建立多角度正常膝关节模型。依据自然膝关节的解剖结构,从中提取出个体膝的结构尺寸及形面特征,设计出渐变形面的膝关节假体,按照全膝关节置换手术的规范流程建立植入渐变形面假体后的全膝三维模型,并通过有限元分析,比较植入假体后对股骨/胫骨关节面等效应力的影响。结果植入渐变形面的假体膝在屈曲角度0°~60°时对于髁面的应力分布影响不大,但大于60°,尤其是80°时,应力分布变化明显;另外,对内/外侧髁面的最大等效应力有较大的改变。结论在膝关节假体的设计建模中,尽量重现人体关节构造,益于保证置换后整个膝关节的协调运作。整个设计过程及方法对于完善和改进假体的设计具有重要的参考意义。
[Abstract]:Objective to study the knee prosthesis surface contact stress contour of the prosthesis articular surface. Based on the method of MRI (magnetic resonance imaging) image acquisition and the establishment of multi angle normal knee model. According to the anatomic structure of knee joint, extract the characteristics of individual knee structure size and shape in design gradient shape the knee joint prosthesis, the establishment of three-dimensional model of total knee prosthesis implantation gradient shape according to the standard process of total knee replacement surgery, and through the finite element analysis, effects of implant prosthesis after femoral / tibial articular surface stress. The gradient surface implanted prosthetic knee flexion angle in 0 DEG ~60 DEG for the condyle stress distribution has little effect, but more than 60 degrees, especially at 80 degrees, the stress distribution changed significantly; in addition, there are great changes on the internal / external condyle of the maximum equivalent stress. Conclusion in knee joint prosthesis In the design modeling, we try to reproduce human joint structure as much as possible, so as to ensure the coordinated operation of the whole knee after replacement. The whole design process and method is of great reference value for improving and improving the design of prosthesis.

【作者单位】：北京航空航天大学机械工程及自动化学院;
【基金】：北京航空航天大学研究生教育与发展研究专项基金(4301019)
【分类号】：R687.4;R318.17

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