Diagnostic Performance and Reproducibility of Odontoid Retroflexion Angle and Posterior Basion-C2 Line in Type II Basilar Invagination

Key Points

• The study aims to evaluate the diagnostic performance and reproducibility of odontoid retroflexion angle and basion-C2 line in type II basilar invagination.
• Compared ORA and pB-C2 measurements between type II basilar invagination patients and controls.
• Analyzed the reproducibility of ORA and pB-C2 using statistical methods.
• ORA and pB-C2 measurements were significantly different between patients and controls.
• Both measurements showed limited reproducibility.
• Moderate diagnostic performance was observed for both parameters.