中国组织工程研究2013,Vol.17Issue(4):612-619DOI:10.3969/j.issn.2095-4344.2013.04.008骨与关节生物力学不同运动步态下锁定加压钢板固定胫骨干骨折的有限元分析FiniteelementanalysisofdifferenttibialshaftfracturefixedbyLockingcompressionplateunderdifferentmovementgait全文:PDF摘要背景：目前有限元分析广泛应用于人体骨折内固定模型的力学分析，但大多研究局限于静态下，动态下的骨折模型有限元分析尚未见报道。目的：通过三维有限元分析来探讨锁定加压钢板固定胫骨干不同类型骨折在不同运动步态下的应力分布情况。方法：利用CT扫描获得正常成人胫腓骨及足部的薄层扫描图像；运用相关软件建立其三维模型，在此模型上模拟出胫骨中段横行、斜行、粉碎性、螺旋形4种类型骨折，并与锁定钢板进行装配生成实验模型，各组模型加载相同的轴向压缩载荷600N。通过有限元分析软件Ansys12.0分别测定各组模型在落地相、中立相、离地相三种步态下的应力分布情况。结果与结论：在步态下，胫骨在骨折各组中的应力分布由小到大均为：落地相<中立相<离地相。锁定钢板在胫骨中段横行、斜行、粉碎性骨折中的应力分布由小到大均为：中立相<落地相<离地相；在胫骨中段螺旋形骨折中应力分布由小到大为：离地相<中立相<落地相；提示在运动步态中，钢板和胫骨均在离地相受力最大。钢板的应力集中在中间或边缘；而胫骨的应力分布在骨折线以上靠近近端，骨折线以下靠近骨折线。就胫骨整体而言，呈现两端集中，中间分散的状态。关键词：骨关节植入物；骨与关节三维有限元；胫骨；锁定加压钢板；运动步态；有限元分析；应力分布；内固定；阈值；网格划分；弹性模量；生物力学；省级基金；骨关节植入物图片文章；Abstract：BACKGROUND:Inrecentyears,thefiniteelementanalysishasbeenwidelyusedinthemechanicalanalysisofhumanfractureinternalfixationmodel,butstudiesonthefiniteelementanalysisareoftenunderthestaticstate,thereportsonthefiniteelementanalysisunderphysiologicalstatearefeOBJECTIVE:Toexplorethestressdistributionofdifferenttibialshaftfracturesfixedbylockingcompressionplateunderdifferentmovementgaitsthroughthree-dimensionalfiniteelementanalysis.METHODS:CTscanwasperformedtoobtainthethinlayerscanningimageofnormaladulttibiofibulaandfoot;three-dimensionalmodelswereestablishedbyrelativesoftware,andthentransverse,oblique,spiral,comminutedfractureswereimitatedonthemodelsandcombinedwiththelockingplatetogeneratetheexperimentalmodels.Themodelsineachgroupweresubjectedtothesameaxialcompressionloadof600N.Thestressdistributionofthemodelsunderheel-strikephase,themidstancephaseandthepush-offphasewasanalyzedwithsoftwareAnsys12.0.RESULTSANDCONCLUSION:Underthisexperimentalmodel,thestressdistributionoftibiainfourgroupsfromsmalltolargewasheel-strikephase<midstancephase<push-offphase;thestressdistributionoflockingcompressionplateinthetibialtransverse,obliqueandcomminutedfracturesfromsmalltolargewasthemidstancephase<theheel-strikephase<thepush-offphase;stressdistributionoflockingcompressionplateinthetibialspiralfracturegroupfromsmalltolargewasthepush-offphase<themidstancephase<theheel-strikephase.Underthephysiologicalstate,thelargeststressofthelockingcompressionplateandthetibiawereinthepush-offphase.Thestressdistributionofthelockingcompressionplatefocusedonthemiddleoredgeofitself;whilethestressdistributionofthetibiafocusedontheproximalendabovethefracturelineandontheendunderthefractureline.Fromtheoverallofthetibia,thestressdistributionfocusedonbothends,andscatteredonthemiddle.Keywords：boneandjointimplants;three-dimensionalfiniteelementanalysisofboneandjoint;tibia;lockingcompressionplate;movementgaits;finiteelementanalysis;stressdistribution;int...