Spondylolisthesis outcomes followed for more than 1 y (15 mo mean follow-up).
| Outcome Measure | Spondylolisthesis (n = 23) | No Spondylolisthesis (n = 25) |
| VAS score, mean | ||
| Preoperative | 6.0 | 5.5 |
| Postoperative | 2.7 | 2.9 |
| ∆ | 3.3 | 2.6 |
| Reduction | 55% | 47% |
| ODI, mean | ||
| Preoperative | 50.5 | 43.4 |
| Postoperative | 24.4 | 24.2 |
| ∆ | 26.1 | 19.2 |
| Reduction | 52% | 44% |
Abbreviations: ODI, Oswestry Disability Index; VAS, visual analog scale.