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Simulated clinical grading of pedicle screws according to Gertzbein grade, at different max screw diameters. Gertzbein grade 0 and 1 are considered clinically accurate.
| Gertzbein Grade 0 (no. of screws) | Gertzbein Grade 1 (no. of screws) | Gertzbein Grade 2 (no. of screws) | Gertzbein Grade 3 (no. of screws) | Clinical Accuracy | |
|---|---|---|---|---|---|
| 4-mm screw | 103 | 10 | 0 | 0 | 100% |
| 6-mm screw | 95 | 18 | 0 | 0 | 100% |
| 7-mm screw | 93 | 20 | 0 | 0 | 100% |
