Table 2 Screw and pedicle diameter as well as the corresponding screw-to-pedicle diameter ratio (SPR) for all levels.

From: Comparison of different imaging devices and navigation systems for cervical pedicle screw placement: an experimental study on screw accuracy, screw placement time and radiation dose

Level

Diameter [mm]

SPR

Screw

Pedicle

C2

3.5

4.3

0.81

C3

3.5

3.5

1.00

C4

3.5

3.2

1.10

C5

3.5

3.3

1.06

C6

3.5

4.3

0.81

C7

3.5

5.5

0.64

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