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Direction and grading for malpositioned screws
| Minor | Moderate | Severe | Total number | |
|---|---|---|---|---|
| Pedicles medially | 13 | 5 | 17 | 35 |
| Pedicles laterally | 9 | 3 | 12 | 24 |
| Anterior cortex | 9 | 8 | 7 | 24 |
| Cervical vertebral lateral mass | 1 | 2 | 6 | 9 |
| Vertebral end plates | 3 | 3 | 2 | 8 |
| Odontoid process | 1 | 1 |
