Table 1.

Linear parameters measured at the isthmus of the pedicle

Pedicle	OPW (mm)	OPH (mm)	IPW (mm)	IPH (mm)
C3
Mean	5.7	7.5	2.2	2.9
SD	0.4	0.7	0.3	0.5
Range	5.0–6.5	7.0–8.8	1.8–2.6	2.6–3.9
C4
Mean	5.6	7.1	2.4	2.7
SD	0.6	0.7	0.6	0.6
Range	5.0–6.8	6.2–8.0	1.8–3.4	1.8–3.4
C5
Mean	6.2	6.8	2.5	2.6
SD	0.6	0.5	0.4	0.5
Range	5.5–7.0	6.4–7.7	2.1–3.1	2.1–3.2
C6
Mean	6.7	6.7	2.7	2.6
SD	0.6	1.2	0.5	0.6
Range	6.1–7.7	5.7–8.3	2.3–3.8	2.2–3.8
C7
Mean	7.9	7.2	3.9	3.4
SD	1.1	0.7	1.2	0.4
Range	6.6–9.3	6.1–8.1	2.2–5.8	2.9–3.8

OPW outer pedicle width, OPH outer pedicle height, IPW inner pedicle width, IPH inner pedicle height (cp. Fig. 1)