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1、AbstractRecentdecades,satisfactoryresultshavebeenachievedforlumbarfractureandlumbarspondylisthesiswithposteriorpedicleinternalfixationinstrument.However,thereportedcomplicationsoftheinstrumentationshouldbeappealledtoouremphases,whichassociatedwithoperativeprocedure.Theessentialprocedureistoensureth
2、epediclescrewplatinginthepedicleofvertebraeaccurately.Asaresult,wemakesomereseachintheanatomicfeatureoflumbarvertebraearchinordertofindsomewayincreasingthesuccessrateofplatingpediclescrew.1.TheanatomicstudyinthepedicleofvertebraearchUsing30adultsdrylumbarspecimens,measurethedateofPW(pediclewidth),P
3、A(pedicleangle),SSA(sagitalscrewangle),thequantitativerelationshipbetweenthelateralmarginofthesuperiorfacetandthepediclecenteroflumbarvertebrae,thequantitativerelationshipbetweenthecenterofthepedicleandaxisofthetransverseprocess.Result:PW:LI:7.211.8mm,L2:8.6士1.4mm,L3:10.411.9mm,L4:11.712.lmm,L5:15.
4、2土2.8mm,andtheminimumPWofLI:3.9mm,themaximumPWofL5:16.6mm.PA:LI:7.211.10，L2:8.7士2.30，L3:13.211.60，L4:17.1土2.80，L5:23.4士3.10.SSA:L1:100.38士4.760，L2:106.13士6.340，L3:109.22士7.390，L4:114.15士8.460，L5:120.06士6.230.Asacommonrule,mostlythecenteroflumbarvertebraeisinsidethemarginofthesuperiorfacetinLl-L3,an
5、dthecenteroflumbarvertebraeisjustintheplaceofthemarginofthesuperiorfacetinL4frequently,thecenteroflumbarvertebraeislateraltothemarginofthesuperiorfacetmostly;theaxisofthetransverseprocessisinferiortothecenterofpedicleinLl-L3aswell,morethananhalfoftheaxisofthetransverseprocessisintheplaceofthecenter
6、ofpedicleinL4,manyofaxisofthetransverseprocessissuperiortothecenterofpedicleinL5.Measurethedirectionofspinousprocessandtheangleofspinousprocess,wefindthemostofdirectionofspinousprocessistoright,therangeofangleisfrom00to110.Sowebelievethewaytoplatethepediclescrewbyanatomicfeatureisnotideal.2.Estimat
7、ethemethodtoplatethepediclescrewonthebassofthedigitaldataofthetransversescrewangle.sagittalscrewangle.thedistancebetweentwopointwherethescrewisplatedintothepedicleofvertebraearchMeasurethedigitaldataofPWand
