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0102030AchillesQuadMaximumStressMPa0.00.51.01.5AchillesQuadMax.Strainmmmm0100200300AchillesQuadModulusMPa0.01.02.03.0AchillesQuadCyclicElongation050010001500AchillesQuadMaximumLoadN051015AchillesQuadDisp.atMaxLoadmm0100200300AchillesQuadStiffnessNmmp0.022ResultsAllspecimensailedeitherbyboneavulsioneightAchillesandtwoquadricepstendonsortendonmid-substanceruptureoneAchillesandsevenquadricepstendons.Noslippageorailureatthegripwasobserved.BiomechanicalresultsindicatedthattherewerenosignifcantdierencesinmaximumloadstinessstressmaximumstrainstrainatmaximumstressmodulusoelasticityandcyclicelongationbetweenthequadricepsandAchillesten-dons.QuadricepstendonhadsignifcantlygreaterdisplacementatmaximumloadthanAchillestendonsp0.022.QuadricepsTendonAllogratsareBiomechanicallyEquivalenttoAchillesTendonAllogratsConclusionsThisdirectbiomechanicalcomparisonoquadricepsandAchillestendonallogratsshowednostatisticallysignifcantdierencesinsevenoutoeightstructuralandmaterialproperties.Thedier-enceindisplacementatmaximumloadmaybeattributabletodensityvariationsinthebonyattachmentsothetwotendonsasthecancellousboneothepatellaisgenerallythickerandmorecompactthanthatothecalcaneus.Thismayalsoexplaina22boneavulsionrateorquadricepstendonscomparedtoan89avulsionrateorAchillestendonswhichsuggestsastrongpatel-la-quadricepstendoninteracethatshitedtheailureinitiationtothetendon.Ourresultsalsorepresentonlytwobundlesothequadricepstendon.Shouldclinicianschoosetoutilizetheentiretendontheincreasedtissuemasscouldbolsteritsbiomechanicalcapabilities.BasedonourbiomechanicalresultswerecommendquadricepstendonallogratsoruseinACL-RasanalternativetoAchillestendonallograts.