鄭 軼(Zheng Yi，Postgraduate School Southern Med Univ，Guangzhou 510515)…∥Chin J Clin Basic Orthop Res.－2010，2(3).－196～199

Analysis of differences between anatomic and CT measurements for anterior axial pedicle screw placement

鄭 軼(Zheng Yi，Postgraduate School Southern Med Univ，Guangzhou 510515)…∥Chin J Clin Basic Orthop Res.－2010，2(3).－196～199

ObjectiveTo explore the differences between anatomic and CT measurements for anterior transoral axial pedicle screw placement.MethodsC2 vertebrae of 60 adult spines were measured anatomically，while 20 adult spine vertebrae were measured by CT scanning.Measurement parameters of inserting pedicle screws including the distance from screw entrance point to the sagittal midline of spine(OC)，the screw insertion channel length(DE)，thc extraversion angle α and the declination angle β of screw insertion were compared between anatomic and CT measurements.ResultsThe differences between anatomic and CT measurements of OC(the left side，the right side and both sides)，DE(the left side and both sides)，α (the right side and both sides)and β (the left side，the right side and both sides)had statistical significance(P ＜0.05).ConclusionThere are determinate differences of pedicle screws insertion parameters between anatomic and CT measurements.As a result，best screw entrance point and angles should be determined for the integrated consideration of parameters obtained by two measurement methods.10 refs，1 fig，3 tabs.

(Authors)