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Distribution of the screw positions using the classification of Zdichavsky et al. [31]
| Screws n = 406 | Position | Number of pedicle screw positions in CT | Correct assessment of 3D-imaging |
|---|---|---|---|
| Correct | Ia | 378 | 376 |
| Lateral malposition | Ib | 12 | 9 |
| IIa | 5 | 5 | |
| IIIa | 1 | 1 | |
| Medial malposition | IIb | 9 | 6 |
| IIIb | 1 | 0 | |
| Disagreement | – | 9 | |
| 406 | 406 |
