Lumbosacral vertebrae in humans usually bear heavy loads and are a focus of biomechanical analysis.In order to improve the efficiency and flexibility of the modeling of lumbosacral vertebrae,a method of parametric mod-eling has been proposed.Several characteristic parameters of vertebrae were measured in CT images,and a L3-S1 lumbosacral model with 14 characteristic parameters was developed by modeling software.In addition,a three-di-mensional reconstructed lumbosacral model was derived based on the same CT sample.The same boundary condi-tions were applied in the two models and finite element analysis(FEA)was performed.The validity of the model was tested by comparing the results of FEA with experiments or literature simulations.The intervertebral range of motion,maximum stress of the nucleus and other mechanical characteristics of the parametric model and the recon-structed model were studied based on the outcomes of FEA.The two models were close to the literature results in terms of their mechanical characteristics,which confirms their validity.The mechanical characteristics of the two models were generally the same for intervertebral range of motion,as well in the variation with different loads and maximum stress in nucleus pulposus.The parametric lumbosacral finite element model proposed in this paper can effectively improve the efficiency of lumbosacral finite element modeling and analysis,and could replace a recon-structed model to some extent.
关键词
参数化建模/腰骶椎/生物力学/有限元
Key words
parametric modeling/lumbosacral vertebrae/biomechanics/finite element
维普
万方数据