Table 2 Pedicle screw-related variables
Variable | N = 742 |
|---|---|
Adequate insertion | 714 (96.2) |
Misplacement | 28 (3.8) |
Penetration | |
Minor | 14 (1.9) |
Moderate | 8 (1.1) |
Severe | 6 (0.8) |
Pedicle screw pull-out | 58 (7.8) |
Pedicle screw pull-out and misplacement | 7 (0.9) |
Pull-out area | |
Upper instrumented vertebra | 9 (15.5) |
Inter-levels | 38 (65.5) |
Lower instrumented vertebra | 11 (19.0) |