前路经枢椎体至寰椎侧块螺钉内固定的生物力学实验研究

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1、重庆医科大学硕士研究生学位论文2．TogainthedatabyCTscanningoccipitocervicalspecimen(C0一C3)，andtheywereimputedtheMimics10．0softwaretoextracttheboneandligamentofCo—C3，andmodifiedthemodel．ThenitwereimportedtheFEAsoftwarePatran2005bytheOUTformattoproducttetrahedronmesh，andderivedbytheOUTformat．Thematerialparametersw

2、eredistributedtothemodelintheMimicsSOftware．Sothethree．dimensionalfiniteelementmodel(TDFEM)wascompleted．3．TheTDFEMofIOC，TOF,PTS，ASMandASMG，incorrespondingwithExperimentalgroups，wereestablishedbyPatran2005．TheC3’Sbosomofthemodelswererestraintedbydefiningsix-freedomdegreeforzero．Thentheyweremobile

3、dinflexion／extension，left／rightlateralbending，left／rightaxialrotationbyloading1．5NmatCo，analysedbetweenthedisplacementofAAJandthestressofvarioussectionsoftheatlantoaxialvertebrabyPatran2005．Result：1．TherewasgenerallysignificantdifferencebetweengroupIOCandothergroups，andbetweengroupTOFandgroupPTS

4、，ASMandASMGbystatisticalanalysis(p<0。oo1)．GroupASMG，ASMandPTSsignificantlydecreasedrangeofmotioninalldirections．TherewasgenerallysignificantdifferencebetweengroupASMGandgroupASMandPTSinflexionandextensionandlateralbendingsbystatisticalanalysis(p

5、dgroupASMandPTSin6重庆医科大学硕士研究生学位论文flexionandextensionandlateralbendingsbystatisticalanalysis(p<0．05)，andnodifferenceinaxialrotationbystatisticalanalysis(p>0．05)．2．TheestablishmentoftheatlantoaxialvertebraTDFEMincludedCorticalbone，Cancellousboneandligament．Themodelhighlysimulatecervicalvertebrastr

6、uctureandthematerialproperty，whichstructurewasintegrated．Thespatialstructuresurveyedhighaccuracy，andtheunitdividedfine．ThenodeandelementnumberoftheIOCTDFEMrespectivelywas9178and40356．ResultsindicatedthatthefacetofatlantoaxiallateraljointsandthefrontpartofC2bodywerethestressconcentrationregionsan

7、dalsohighbonemineraldensityregions．3．ItisquitesimilarityfortheresultofbetweentheexperimentandFEA．ASMG，PTSandASMcanobviouslyreducethethree—dimensionalrangeofmotionClrelativetoC2．Conclusion：1．ASMCanprovidethesatisfiedstability