Image Type Cervical Spine X-Ray CT Scan MRI Scan Atlantodental Interval (ADI) Basion–Axial Interval (BAI) Basion–Dens Interval (BDI) Canal Occupying Ratio (COR) Clivo-Axial Angle Facet Joint Overlap (Percent Overlap Method) Facet Joint Step-Off/Dislocation Grabb-Oakes Measurement (pB - C2 line) Occipital Condyle–C1 Interval (CCI) Posterior Atlantodental Interval (PADI) Power’s Ratio Sagittal Vertical Axis (SVA) Segmental Angle Translation on Sagittal Reconstruction
