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Procedures and actual levels operated on
| Procedure and level | Group A | Group B |
|---|---|---|
| Posterior procedure | ||
| French window laminoplasty | ||
| C1–7 | 0 | 1a |
| C3–5 | 1 | 0 |
| C3–6 | 20 | 55 |
| C3–7 | 10b | 36b |
| C4–6 | 2 | 4 |
| C4–7 | 0 | 2 |
| Open-door laminoplasty | ||
| C3–6 | 4 | 9 |
| C3–7 | 0 | 12 |
| Laminectomy | ||
| C4–7 | 0 | 1 |
| Anterior procedure | ||
| C3–4 | 0 | 1 |
| C4–5 | 0 | 2 |
| C4–6 | 0 | 1 |
aThis patient underwent additional posterior arthrodesis
bTwo patients each underwent additional posterior arthrodesis
