Classifications for thoracolumbar pedicle screw fixations.
| Classification | Group | |
| O-Arm | Surgivisio | |
| Heary | ||
| I | 36 | 58 |
| II | 1 | 14 |
| II | 0 | 4 |
| IV | 1 | 6 |
| V | 0 | 0 |
| Total No. of thoracic screws | 38 | 82 |
| Gertzbein | ||
| A | 179 | 170 |
| B | 10 | 23 |
| C | 1 | 3 |
| D | 0 | 2 |
| E | 0 | 4 |
| Total No. of lumbar screws | 190 | 202 |