| Variables (n = 20) | Clinical characters | |
| No. | % | |
| Type of procedure | ||
| Open surgery | 12 | 60% |
| Endoscopic | 4 | 20% |
| Microscopic | 4 | 20% |
| Extent of facet resection | ||
| Medial facetectomy | 17 | 85% |
| Full facetectomy | 3 | 15% |
| Postoperative complication | ||
| No | 19 | 95% |
| Yes | 1 | 5% |