| Salvage patients N = 15 | Non-salvage patients N = 93 | P |
---|---|---|---|
VAS of neck pain | |||
 Pre-operation | 5.93 ± 1.20 | 6.29 ± 1.44 | 0.363 |
 3 months after operation | 1.38 ± 0.63* | 1.44 ± 1.01* | 0.804 |
 Final follow-up | 1.29 ± 0.55** | 1.36 ± 0.91** | 0.738 |
NDI score | |||
 Pre-operation | 34.53 ± 4.94 | 35.35 ± 5.89 | 0.610 |
 3 months after operation | 3.73 ± 2.25*** | 4.20 ± 2.90*** | 0.550 |
 Final follow-up | 3.13 ± 2.95**** | 4.42 ± 2.80**** | 0.104 |