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Objective: To evaluate the relationship of the odontoid peg of C2 to the standard skull base lines of Chamberlain’s, McGregor’s and McRae’s on computed tomography.
Design: Descriptive cross-sectional study
Setting: Kenyatta National Hospital, Nairobi, between April and September 2010.
Results: The mean position of the odontoid process was 2.6 mm below Chamberlain’s line (median 2.7 mm, SD 2.2 mm), 1.0mm (median 0.9 mm, SD 2.1 mm) below McGregor’s line and 4.7 mm (median 4.6 mm, SD 1.3 mm) below McRae’s line. There was no statistically significant difference in measurements between male and female patients, the different age groups and between CT and standard plain radiograph measurements (p > 0.05).
Conclusion: Anthropometric measurements obtained using CT were lower than those from plain radiographs. There was however no statistical significant difference between the two imaging modalities. CT demonstrated far much superior anatomical detail compared to plain radiographs.