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GammaIrradiatedSoftTissueAllograftsareBiomechanicallyEquivalenttoAsepticNon-SterilizedTissuesEgleideY.ElenesM.S.andShawnA.HunterPh.D.AbstractAllogratsaetyiscontingentoneectivesterilizationmethodssuchasgammairra-diation.Howeverrecentclinicalstudieshaveassociatedgammairradiationwithde-creasedgratstrengthandincreasedallogratailureratesdespitedatathatshowsnodeleteriouseectstosottissuebiomechanicsatgammadosesbetween1.46and2.18mRad.Theobjectiveothisstudywastocomparethebiomechanicalpropertiesoan-teriorandposteriortibialistendonsandbone-patellarligament-boneBTBallogratssterilizedwithgammairradiationatadoseo1.7-2.1mRadtoasepticallyprocessednon-irradiatedtendons.Ourhypothesiswasthatgammairradiatedtendonswouldbebiomechanicallyequivalenttoasepticcontrols.Pairsoresh-rozentibialistendonsandbisectedBTBswereeithergammasterilizedorletuntreatedtoserveasasepticallyprocessednon-sterilizedcontrols.Eachgratwascyclicallyloadedintensionor2000cyclesatarateo2Hzallowedtorelaxorfveminutesandthentestedintensiontoailureat100strainrate.GammairradiatedBTBsexhibitedstructuralmaximumloadmaximumdisplacementstinessandmaterialailurestressailurestrainandelasticmoduliandcyclictendonelongationpropertiesthatwerenotsignifcantlydierentromnon-sterilizedcontrols.Gammasterilizedtibialistendonswerenotsignifcantlydierentromasepticcontrolsorthethreestructuralpropertiesandthreeotheourmaterialpropertiesbutdidhavelowercyclicelongationcomparedtocontrols.Thisdi-erencesuggeststhatgamma-treatedtibialistendonsmaybelesssusceptibletolaxitythanasepticgrats.Thisstudyreinorcesthattendonsterilizationviagammairradiationyieldsasaeallogratwithoutcomprisingbiomechanicalunction.