Table 3. Summary of the results of pedicular screws placement in the FS group.
FS: conventional fluoroscopy
| Vertebral level | No. of inserted screws | No. of breached screws (grades B-D) | Medial breach | Lateral breach | Minor <2 mm, (grade B) | Moderate 2-4 mm, (grade C) | Severe >4 mm, (grade D) |
| L1 | 6 | 0 | 0 | 0 | 0 | 0 | 0 |
| L2 | 10 | 1 (10%) | 1 (100%) | 0 | 1 (100%) | 0 | 0 |
| L3 | 36 | 9 (25%) | 6 (66.7%) | 3 (33.3%) | 7 (77.8%) | 2 (22.2%) | 0 |
| L4 | 91 | 37 (40.6%) | 19 (51.4%) | 18 (48.6%) | 23 (62.2%) | 12 (32.4%) | 2 (5.4%) |
| L5 | 109 | 29 (26.6) | 8 (27.6%) | 21 (72.4%) | 12 (41.4%) | 14 (28.3%) | 3 (10.3%) |
| Total | 252 | 76 | 34 | 42 | 42 | 28 | 5 |