NDI and pain status (% of patients) at last follow-up in 1-level TDR and ACDF.
| NDI | VAS Neck Pain | |||||
|---|---|---|---|---|---|---|
| Status* | TDR | ACDF | P value† | TDR | ACDF | P value† |
| Improved | 84.6% | 84.8% | 0.72 | 87.5% | 83.3% | 0.21 |
| Not improved | 14.2% | 12.7% | 8.8% | 15.4% | ||
| Worse | 1.2% | 2.5% | 3.8% | 1.3% | ||
↵* NDI: Improved: ≥15/100 point increase from baseline. Not improved: < 15 point change (±) from baseline. Worse: ≤ -15/100 point decrease from baseline. Neck pain: Improved: ≥10/100 point increase from baseline. Not improved: < 10 point change (±) from baseline. Worse: ≤ -10/100 point decrease from baseline.
↵† Fisher’s exact test.