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Type of anterior procedure
| Anterior procedure | No. | % |
|---|---|---|
| Single level ADR | 131 | 44 |
| Single level ALIF | 87 | 29 |
| Two levels ALIF | 54 | 18 |
| Two levels ADR | 14 | 5 |
| Two levels ADR/ALIF | 10 | 3 |
| Three levels ALIF | 1 | 0.3 |
| Three levels ADR/ALIF/ALIF | 1 | 0.3 |
| Three levels ADR/ADR/ALIF | 2 | 0.6 |
| Four levels ADR/ADR/ALIF/ALIF | 3 | 1 |
| Four levels ALIF | 1 | 0.3 |
