Vertebral-spinal discrepancy reported in neutral position across 2 independent observers, between neutral and flexion positions and neutral and extension positionsa
| C3 | C4 | C5 | C6 | C7 | |
|---|---|---|---|---|---|
| Neutral position across 2 independent reviewers (mm) | 1.0 | 1.3 | 1.3 | 0.9 | 1.1 |
| Neutral flexion (mm) | 1.3 | 0.7 | 1.2 | 0.8 | 1.9 |
| Neutral extension (mm) | 1.4 | 0.7 | 1.0 | 1.0 | 1.0 |
↵a Results are reported in millimeters. These results suggest that flexion or extension that is possible within the confines of the MR imaging environment does not affect the relative positions of vertebral and spinal cord segments.