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Classification based on the distance between the posterior VA surface and the posterior line of the vertebral body
| Classification (%) | C3 | C3/4 | C4 | C4/5 | C5 | C5/6 | C6 | C6/7 | C7 |
|---|---|---|---|---|---|---|---|---|---|
| Safe (>2 mm) | 82.5 | 98.5 | 97.1 | 99 | 99.5 | 98.5 | 98.5 | 99.5 | 100 |
| Needing attention (2 mm ≥) | 16.0 | 1.0 | 2.4 | 0.5 | 0.5 | 1.5 | 1.5 | 0 | 0 |
| Unsafe (0 mm ≥) | 1.5 | 0.5 | 0.5 | 0.5 | 0 | 0 | 0 | 0.5 | 0 |
