Abstract: [
Abstract ] Objective TousehighfrequencyultrasoundcombinedwithEMGinthediagnosis
ofcubitaltunnelsyndrome.Methods Thirty-twopatientsandthirty-twohealthyvolunteerswere
testedinhighfrequencyultrasoundandEMGrespectively.Theechochangesoftheulnarnerve ,
themaximumtransversediameter , thecircumference , thecross-sectionalarea ( CSA ) andthe
surroundingtissuewereobservedbyhighfrequencyultrasound.Atthesametime , testingthe
motornerveconductionvelocity ( MNCV ) andamplitudeofwristtoelbowunder5cm , elbow
under5cmtoelbowandelbowtoelbowabove5cmatsegmental.Thesensorynerveconduction velocity ( SNCV ) and amplitude of little finger to wrist were examined. While the
electrophysiologicalindexofthefirstinterosseousmuscle , abductordigitiminimiandflexorcarpi
ulnarismusclewererecordedbyEMG.ThePearsoncorrelationanalysisbetweenmaximalCSA
andMNCVinthepatientsgroup wasthenperformed.Receiveroperatorcharacteristiccurves
( ROCcurves ) weremadebySPSStogetthediagnosticcriteria.Results Inpatientsgroup ,
comparedwiththehealthyadults , theechoesoftheunlarnervebundlestructuredisplaywere
hypoechoic , obviousimpressioncouldbeseenatlongaxis.Attheshortaxisoftheulnarnerve
echogenicdotsweredisappearandnervediameterwereincreased.TheMNCVfromelbowunder
5cmtoelbowandelbowtoelbowabove5cmweredecreasedsignificantly.TheSNCVfromlittle
fingertowristweredecreasedsignificantly.TheCSAandMNCVhadnegativelycorrelations.The
diagnosticcriterionofCSA was0. 0695cm
2 ,
thesensitivitywas71.4% andthespecificitywas
92.3%.Conclusion Highfrequencyultrasoundcanclearlyshowtheulnarnerveoftheelbow.
CombinedwithhighfrequencyultrasoundandEMGcanbeusedtodiagnosetheinjuryofthe
ulnarnerveattheelbowfrom morphologyandfunction , andtodeterminetheindicationsof
operation.

Key words: cubitaltunnelsyndrome , ultrasonography , electromyography