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Purpose: Toinvestigatewhetherremnant-preservinganteriorcruciateligament(ACL)reconstruction(ACLR)for acutecompleteACLtearscanimprovebiomechanicalstrength,revascularizationstatus,andproprioceptive recoverypotentialofthegraftedtendonscomparedwithconventionalACLR. Methods: AnacutecompleteACLfemoraldetachmentmodelwascreatedin60rabbits.Animalswererandomly allocatedintoremnant-repairingACLRgroup(group1,n=30)andconventionalACLRgroup(group2,n=30). TheACLremnantswereeitheracutelyrepairedwithfemoral-tensioningtechniqueingroup1orcompletely debridedingroup2.Forgroup1,remnantsstructuralintegritywasevaluatedmacroscopicallyanddividedinto gradeA(bridging)orgradeB(notbridging)femurandtibia.Thenremnant-to-grafthealingcapacitywas assessedhistologically.Forintergroupcomparisons,biomechanicalstrength,revascularizationstatus(vascular endothelialgrowthfactor,VEGF),andproprioceptivereceptor(neurofilament,NF)ofthegraftedtendonswere evaluatedbytensiletestsandimmunofluorescentstaining,respectively.Allassessmentswereperformed postoperativelyatweek24. Results: Remnantsingroup1showed60%(18/30)weregradeAand40%(12/30)weregradeBstructural integrity.Anobviousremnant-to-graftintervalcouldbedetectedthroughthewholelengthofgraft.Tensiletests showedthatultimatefailureloadofgraftedtendonsweresimilarbetweengroups(P=.365).Additionally,there werenosignificantdifferencesforthenumberofVEGF-positivevesselsandNF-positivemechanoreceptorson neitherthefemoral(P=.887&.578),mid-substance(P=.063&.546)northetibiallevel(P=.193&.978)within graftedtendonsbetweengroups. Conclusions: Theacuteremnant-repairingACLRinourrabbitfemoralACLdetachmentmodelshowedno biomechanicalandbiologicaladvantagescomparedtoconventionalACLR.TheacutelyrepairedACLremnants presentedahighproportionofpoorstructuralintegrityandlowremnant-to-grafthealingcapacity.