Fig. 2
a and b The “MPR” operation in the toolbar of software was performed. First, possible deformity or inaccurate acquisition techniques were corrected to the actual axial and sagittal plane of C2 vertebrae by manipulating the multiplanar reconstructions. c and d Then, consecutive cross-sectional slices of the oblique coronal planes perpendicular to the pedicle axis of both the axial and sagittal planes were determined. e and f Among those consecutive sections, the narrowest portion of the PIC was identified. The widths of the endosteal cavity (MPD1) and outer diameter (MPD2) were measured at the narrowest sections of the PIC