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Measurement of Atlas and Its Significance for Clinical Application

Li Guicheng1 Qin Binglan2 Feng Zhaoshan1 Chen Jinxu1 Lin Junhua11 (Department of Human Anatomy,Liuzhou Medical College,Liuzhou 545006,China)2 (The Second Hospital Attached to Liuzhou Medical College,Liuzhou 545006,China)  
Objective To measure Chinese atlas so as to provide anatomical data for the screw design and fixation of the atlas. Methods The relative parameters of 55 sets of dry Chinese adults'atlas specimens were measured with a vernier caliper and a goniometer,including the length of the lateral mass of atlas,the middle width and thickness of atlas lateral mass,the midpoint of the lateral border of the lateral mass height,the midpoint of the medial margin of lateral mass height,the longitudinal direction of lateral mass to sagittal and frontal plane,the width and height of posterior edge of atlas lateral mass,the height and thickness of atlas at the junction of anterior arch and lateral mass. the anteriorposterior diameter and transverse diameter foramen,the height and width in vertebral artery channel,the height and width bone of vertebral artery groove at the bottom of the thinnest ect. The data were also statistically analyzed. Results The length of atlas lateral mass is (23.29±1.47) mm,the middle width and thickness of atlas lateral mass is (11.13±1.17)mm,the midpoint of the lateral border of the lateral mass height is (19.18±1.61)mm,the midpoint of the lateral border of the lateral mass height is (9.64±0.94)mm,the longitudinal direction of lateral mass to sagittal and frontal plane is respectively (19.95±3.32)°and (24.53±2.31)°; the width and height of posterior edge of atlas lateral mass are respectively (9.64±0.94)mm and (4.27±0.63)mm; the height and thickness of atlas at the junction of anterior arch and lateral mass are (11.05±1.12)mm and (4.82±0.65)mm; the anteriorposterior diameter and transverse diameter foramen are respectively (7.30±0.89)mm,(5.90±0.78)mm and the height and width in vertebral artery channel is (8.40±0.58)mm,(6.38±0.79)mm;the height and width of the thinnest point at the bottom of the bone of vertebral artery groove are respectively (7.25±1.27)mm and (4.16±0.83)mm. The above data on the left and right is shown to be no significant difference (P0.05). Conclusion The data of Chinese atlas of 55 cases is obtained successfully,which may be using for the internal fixation in the posterior on edge of atlas lateral mass and atlas pedicle.
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