Influence of pedicle transverse diameter on security of screw implantation in adult thoracic vertebrae / 吉林大学学报(医学版)

ABSTRACT

Objective To identify the effect of morphology of adult upper and middle thoracic pedicle on security of screw implantation.Methods Five fresh adult cadaveric thoracic spine from T1 to T8 were harvested.Pedicle transverse diameters were measured and compared with the smallest diameter(4.5 mm) of screw used in clinic.The screws were inserted and implant effect was observed.Results The mean transverse diameter of adult thoracic(T1-T8) were T14.74(3.85-5.25)mm,T24.51(3.45-5.25)mm,T34.15(3.60-4.65)mm,T43.75(3.10-4.50)mm,T54.25(3.70-4.65)mm,T6 4.53(4.40-4.70)mm,T75.38(5.25-5.60)mm,T85.55(5.50-5.80)mm.Of all specimens,there were 9 specmen(22.5%) whose tranverse diameters were smaller than 4.5 mm.After implantation,two screws broke through pedicle lateral wall.Conclusion Adult pedicle transverse diameters in T3-T4 are smallest,transpedicular screw placement is difficult in some of these vertebrae,but in most of thoracic vertebrae,pedicle tranverse diameter could permit screw implanting in security.