Table 1.

Description of anatomical parameters measured

Parameter	Measurement	Description
OPW	Outer Pedicle Width	Distance medial border of transverse foramen to medial border of pedicle
OPH	Outer Pedicle Height	Distance upper to lower pedicle surface in sagittal plane
ltPA	Left transverse Pedicle Angle	Angle formed between transverse pedicle axis and mid-sagittal line
lsPA	Left sagittal Pedicle Angle	Angle formed between plane of anterior vertebral body wall at mid-sagittal line and sagittal pedicle axis
DltIP/DrtIP	Left/right transverse Intersection Point	Transverse intersection point of transverse pedicle axis with anterior vertebral body wall
DrsIP/DlsIP	Left/right sagittal Intersection Point	Sagittal intersection point of transverse pedicle axis with anterior vertebral wall