Table 1 Morphometric parameters of cervical spine pedicles

Outer pedicle height

Outer superior to inferior diameter of the pedicle isthmus

Outer pedicle width

Outer medial to lateral diameter of the pedicle isthmus

Inner pedicle height

Superior to inferior diameter of the cancellous core of the pedicle isthmus

Inner pedicle width

Medial to lateral diameter of the cancellous core of the pedicle isthmus

Pedicle axis length

Distance from the posterior projective points of the pedicle axis on the lateral mass to the anterior margin of the vertebral body

Pedicle length

Distance from the posterior projective points of the pedicle axis on the lateral mass to the junction of the vertebral body and pedicle

Superior pedicle distance

Distance from the inferior edge of the superior facet to the posterior projective points of the pedicle axis on the lateral mass

Lateral pedicle distance

Distance from the lateral edge of the lateral mass to the posterior projective points of the pedicle axis on the lateral mass

Pedicle transverse angle

The angle between the pedicle axis projection and the anatomic sagittal plane

Interpedicular distance

Distance between the most medial point of the pedicle isthmus in the transverse plane