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1、126°,withtheaverageof112.6±9.2°.Thesymptomsofallpatientsdidnotimproveafterthetreatmentofskulltraction,and2casesbecameworse.Allpatientswereoperatedbycombiningtransoralodontoidectomywithoccipital-cervicalfusionwithintraoperativeneuro-physiologicalmonitoring.Amongthem,4caseswereoperatedbythe
2、traditionaltransoralapproach;11caseswereoperatedbymicroscopictransoralapproach.TomeasureparametersofthesepatientsonCL,ML,WL,Klausheightindex,extensioncordangleandclivuscanalanglebeforeandafteroperationaccordingtoeachpatientimagingdataandcompareditwithpairedTteststatistics.TheJapaneseOrtho
3、pedicAssociation(JOA)wasusedforevaluatingspinalcordfuncionofeachpatient.Surgicalcomplicationsandgraft-bonefusionwerealsorecorded.Result:Allpatientswereachievedsatisfiedfollowed-up.Thefollowed-uptimeofallpatientsrangedfrom12monthsto20months,withtheaverageof16months.Theimagingparametersofth
4、esepatientsonCL,ML,WL,Klausheightindex,cervicomedullaryangleandclivuscanalanglebeforeoperationwere15～20mm、10～16mm、13～19mm、10～23mm、95～126°、105～128°respectively.Andafteroperationitwere-5～-2mm、-7～-3mm、-5～2mm、30.5～42.5mm、152～175°、131～146°respectively.Comparedtopreoperativeimagingparameters,po
5、stoperativeimagingparameterswereimprovedobviously.Therewereobviousstatisticalsignificanceinimagingparametersofthesepatientsbeforeand5万方数据afteroperation(p<0.01).ThemeanJOAscoresofpreoperationandlastfollowed-upafteroperationwere6.5±1.6、14.1±1.2respectively.Theimprovementratiowas71.5%.thenth
6、ecurativeeffectswereshowed:exellentin5cases,goodin9cases,commonin1caseandnopoorcases.Andtherateofexcellentandgoodoftheclinicalresultwas93.3%.TherewerenoobviousdeclinephenomenononamplitudesofSEPandMEPunderintraoperativeneuro-physiologicalmonitoring.Allpatientsshowednocomplications,suchasve
7、rtebral-arteryinjury,leakageofcerebrospinalfluid,infection,failureofgraft-bonefusion,spinalcordandnerverootinjury,etc.4casesoperatedbythetraditionaltransoralprocedureperformedwithtemporomandibularjointpain,while11casesoperatedbymicroscopictransoralapproachdidnotappe
