Objective To measure the anatomical parameters of posterior atlantoaxial structure, so as to provide anatomic basis for the design of posterior atlantoaxial internal fixation system. Methods The anatomical parameters of 30 atlantoaxial vertebra specimens, CT posterior structures of atlantoaxial vertebra of 50 males and 50 females were measured. The CT data of different genders, bone and CT measurements on the left and right side, and bone and CT measurements were compared for statistical significance. Results The height and thickness of the posterior midline of the bone specimens were (10.75±1.38) mm and (8.55±1.77) mm, and the distances from the medial edge of the vertebral artery sulci on both sides to the posterior midline of the bone specimens were (13.45±0.73) mm and (20.28±2.20) mm, respectively. The posterior arch angles of the inner and outer edges were (141.00±3.43) ° and (134.67±2.87) °, respectively. The height and thickness of the posterior midline measured by CT were (10.45±1.61) mm and (8.12±1.57) mm, and the distances between the inner and outer posterior midline and the medial edge of the vertebral artery sulci by CT measurement were (13.60±1.26) mm and (20.48±2.05) mm, respectively. The angle of posterior arch of the inner and outer edges by CT measurement were (141.23±9.64) ° and (135.47±9.02) °, respectively, the radius of the outer edge of posterior arch was (26.77±2.14) mm, the slope rate of the vertebral lamina of the axial vertebra was (58.34±7.60) °. The height from the lower edge of the posterior arch of the atlas to the upper edge of the spinous process of the axial vertebra was (19.07±2.73) mm. The height of posterior atlantoaxial space was (6.83±2.01) mm. There were statistical differences in most of gender in CT data (P<0.05). There was no significant difference in bone specimens and CT data on the left and right sides (P>0.05). There was no significant difference between bone specimens and CT data (P>0.05). Conclusions The anatomical characteristics of posterior atlantoaxial bone structure is relatively fixed. CT can better reflect the characteristics. This study can provide anatomical basis for the design of the posterior atlantoaxial internal fixation system.
Key words
Atlas; /
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Axis; /
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Anatomy; /
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Imaging; /
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Measurement; /
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CT
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