Table 4:
Pedicle Screw Perforation Rates by Vertebral Level (%)
C2
C3
C4
C5
C6
C7
Grade 3
6.7
8.2
14.0
3.1
2.4
2.2
Grade 2+3
6.7
18.4
32.6
21.9
9.8
4.4