脊柱腰段椎间盘有限元力学分析及损伤模拟的中期报告摘要本文旨在探讨脊柱腰段椎间盘的有限元力学分析和损伤模拟的可能性。为此，我们采用了3D有限元软件，对腰段椎间盘进行了建模和仿真。在模型的基础上，我们进行了各种加载实验，分析了椎间盘在垂直、旋转和弯曲等情况下的应力和应变分布。同时，通过对几种不同级别的损伤情况进行模拟，我们也得出了椎间盘在不同损伤情况下的应力和应变分布。结果表明，采用有限元方法对脊柱腰段椎间盘进行力学分析和损伤模拟是可行的，可以为医疗领域提供更深入和全面的了解。我们还发现，椎间盘的应力和应变分布与加载方式、损伤类型有关，需要针对不同情况进行分析和研究。关键词：脊柱；椎间盘；有限元；力学分析；损伤模拟IntroductionThelumbarintervertebraldisc(LID)isacomplexandimportantstructureofthespine.Itisresponsibleforbearingloadsandprovidingflexibilityandmobilitytothespine.However,duetoitscomplexstructureandfunction,theLIDisalsopronetovarioustypesofinjuriesanddegenerativechanges,whichcancausesignificantpainanddisability.Inrecentyears,theuseoffiniteelement(FE)analysishasbecomeincreasinglypopularinthefieldofbiomechanics,especiallyinthestudyofthespineanditscomponents.FEanalysisallowsforadetailedandcomprehensiveanalysisofthemechanicalbehavioroftheLIDunderdifferentloadingconditionsandcanhelptosimulateandpredicttheeffectsofvarioustypesofinjuriesanddegenerativechanges.Inthisstudy,weaimedtoinvestigatethefeasibilityofusingFEanalysistostudythemechanicalbehavioroftheLIDandsimulatedifferenttypesandlevelsofinjuries.Weuseda3DFEsoftwarepackagetomodelandsimulatetheLIDandconductedvariousloadingexperimentstoanalyzethestressandstraindistributionoftheLIDunderdifferentloadingconditions.Wealsosimulatedseveraldifferenttypesofinjuriesandanalyzedthestressandstraindistributionundereachscenario.MethodsTheLIDmodelwascreatedusinga3DFEsoftwarepackage.Themodelconsistedofthreeparts:thenucleuspulposus(NP),theannulusfibrosus(AF),andtheendplate(EP).TheNPwasmodeledasahomogeneous,isotropicmaterialwithapressure-dependentmodulus.TheAFwasmodeledasafiber-reinforcedcompositematerialwithdistinctfiberandmatrixmaterials.TheEPwasmodeledasathinlayerofbonetissueonthetopandbottomofthedisc.VariousloadingexperimentswereconductedontheLIDmodel,includingcompression,rotation,andbending.TheresultswereanalyzedusingstandardFEpost-processingtechniques,includingstressandstraindistributionmaps.Severaldifferenttypesandleve