Clinical outcome scores.
| Outcome Measure | Preop | 6 wk | 6 mo | 12 mo | P (Preop vs 12 mo) |
| Back VAS pain score | 7.8 ± 1.4 | 2.1 ± 0.6 | 1.3 ± 0.8 | 1.2 ± 0.8 | <0.0001 |
| Leg VAS pain score | 6.9 ± 2.8 | 1.8 ± 1.7 | 1.4 ± 1.2 | 1.4 ± 1.3 | <0.0001 |
| Oswestry Disability Index | 61.0 ± 11.5 | 39.0 ± 6.2 | 30.9 ± 16.4 | 32.2 ± 12.2 | <0.0001 |
| SF-12 physical component score | 30.1 ± 6.4 | 44.5 ± 7.8 | 49.0 ± 8.3 | 50.9 ± 5.4 | <0.0001 |
| SF-12 mental component score | 39.0 ± 7.3 | 50.1 ± 7.6 | 52.7 ± 8.1 | 55.3 ± 4.3 | <0.0001 |
Abbreviations: Preop, preoperative; SF-12, Short Form 12-item health survey; VAS, visual analog scale.
Note: Data are presented as mean ± SD.