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iCT-Nav: intraoperative CT-guided navigation
| Vertebral level | No. of inserted screws | Total no. of breached screws | Minor <2 mm, (grade B) | Moderate 2-4 mm, (grade C) | Severe >4 mm, (grade D) |
| L1 | 12 | 0 | 0 | 0 | 0 |
| L2 | 20 | 1 (5%) | 1 | 0 | 0 |
| L3 | 18 | 3 (16.6) | 3 | 0 | 0 |
| L4 | 24 | 5 (20.8) | 5 | 0 | 0 |
| L5 | 24 | 4 (16.6) | 4 | 0 | 0 |
| Total | 98 | 13 | 13 | 0 | 0 |
