Comparison of thoracic and lumbar screws.
| Level | No. of screws | Axial | Sagittal | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mean virtual angle (°) | Mean actual angle (°) | Mean angle difference (°) | Percent error | Mean virtual angle (°) | Mean actual angle (°) | Mean angle difference (°) | Percent error | ||
| Thoracic | 146 | 14.1 | 13.4 | 2.14 | 1.10% | 3.63 | 3.26 | 1.88 | 1.02% |
| Lumbosacral | 94 | 15.9 | 15.5- | 2.22 | 1.12% | 3.73 | 3.86 | 2.61 | 1.41% |
| P value = 0.882 | P value = 0.024 | ||||||||