目的对人工颈椎复合关节系统进行优化设计研究。方法建立人工颈椎复合关节系统的三维模型,并对其进行网格划分,设置植骨孔特征尺寸的变化范围。模拟假体系统在体负载情况对模型进行优化设计分析。对不同尺寸特征的假体系统进行应力、应变分析,并评价系统安全因数。结果计算结果显示系统最大应力出现在植骨孔下方中间区域,最小安全系数出现在上方椎间盘假体和衬垫接触部分。随着植骨孔的扩大,最大应力逐渐增大,最小安全因数呈抛物线变化。结论综合考虑系统的稳定性和植骨需要,认为当植骨孔特征尺寸为3mm时,系统整体效果最优。

Objective To design and optimize the artificial cervical joint complexity.Methods A three-dimension model of the artificial cervical joint complexity was constructed;we meshed the model based on the finite element method.The feature dimension of bone graft cavity in the model was set in a specified varied range.Under the physical load,we operated a simulation to optimize the feature dimension.We analyzed the stress,strain,and had an evaluation on the systematic safety factor.Result The simulation showed that the maximum stress appeared in the central area of the inferior of bone graft cavity,the minimum safety factor appeared in the contact area between the superior disc implant and the pad.As the feature dimension got bigger,the maximum strain increased,the graph of minimum safety factor is a Para-curve.Conclusion Taking the consideration of the systematic constancy and bone graft cavity,the optimal feature dimension of the bone graft cavity is supposed to be 3mm,because the maximum stress becomes the smallest and the systematic safety factor becomes the biggest when the feature dimension is 3mm.