RESUMO
Objective Thisstudyaimedtomeasuretheatlantodentalinterval(ADI)andtherateofasymmetryoflateralatlanto-dental space(LADS)inhealthyUyghurandHanadultsbyMSCTimages.Methods CervicalspineC1~C2of404healthyvolunteers(187 Uyghurand217 Hannationalities)withoutatlanto-axialjointlesionswerescannedwithconventionalspiralMSCT.MPRtechnique wasusedtomeasuretheanteriorADIandthedifferenceinthevarianceofbilaterallateralatlantodentalspace(VBLADS).Results 92.5% ofUyghuradultsand94.0%ofHanadultsshowedasymmetryofbilateralLADS.TheratesandnumbersofasymmetryofbilateralLADS increasedwithage,thedeviationnumberandtheoffsetpercentageincreasing.TheADIdifferedindifferentagegroups,butnodifferencein themeasureofADIbetweenethnicgroupswasobserved.NosignificantdifferenceinVBLADSwasobservedindifferentagegroups. ADI≤2.7mm wasobservedin98% ofUygurandHanhealthycontrolsagedbetween18and29years.Similarly,98% ofsubjectsbetween age30-49presentedwithADI≤2.5mmand98% ofsubjectsaged50orolderpresentedwithADI≤2mm.Conclusion LADSasymmetryis commoninhealthyUyghurandHanpopulation.ThediagnosisofanteriordislocationoftheatlantoaxialjointinUyghurandHanpopulation shouldbemadecautiouslyandbebasedonADIreferencesfordifferentagegroups.