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Prior surgical intervention undertaken at index level
| Prior procedure at index level | No. of patients | Percent |
|---|---|---|
| Laminectomy and discectomy | 14 | 6.7 |
| Endoscopic discectomy | 2 | 1.0 |
| Decompression and fusion | 2 | 1.0 |
| Radiofrequency ablation | 2 | 1.0 |
| Ozone injections | 1 | 0.5 |
