科研之友
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摘要
Object. Posterior odontoid process inclination has been associated with Chiari malformation Type Tin the pediatric population. There are varying reports to support a reliable range of odontoid inclination angles in control adults. The purpose of this study is to estimate the normal measurements in adults for odontoid retroflexion, retroversion, height, and the pB-C2 line (a line drawn through the odontoid tip from the ventral dura perpendicular to a second line from drawn the basion to the inferoposterior aspect of C-2 vertebral body) to establish a normative reference in this population. Methods. After obtaining institutional review board approval, the authors performed a retrospective analysis of non-contrast enhanced cervical spine CT scans obtained in 150 consecutive control adults. Three neuroradiologists measured odontoid retroflexion, odontoid retroversion, odontoid height, and the pB-C2 line. The cohort was divided into sex and two age groups. Comparisons of the means with unpaired 2-tailed t-test were performed. Results. A total of 125 subjects met the inclusion criteria; 80 were men and 45 were women (mean age 52 years, range 18-89 years). The odontoid retroflexion angle ranged from 70 degrees to 89 degrees (mean 79.3 degrees +/- 4.9 degrees), and the odontoid retroversion angle ranged from 57 degrees to 87 degrees (mean 71.9 degrees +/- 5.3 degrees). The range and mean of odontoid height were 17-27 mm and 22 +/- 1.8 mm, respectively. The mean pB-C2 line was 6.5 +/- 2.1 mm with a range of 0-11.2 mm The results were also compared with previously published pediatric data. Conclusions. The current study demonstrates that the odontoid process in adults is anatomically different from that in children: it is longer, more posteriorly inclined, and has a greater pB-C2 line. Therefore, utilization of these parameters with previously published cutoffs in the pediatric population is not appropriate for surgical planning in adults.
- 出版日期2014-2
