TABLE III.
Patient-Reported Outcome Measures*
| Arthroplasty (N = 206) | Fusion (N = 93) | P Value | MCID Achievement | P Value | ||||
|---|---|---|---|---|---|---|---|---|
| N | Value† | N | Value† | Arthroplasty | Fusion | |||
| ODI | ||||||||
| Preop. | 206 | 56.5 ± 12.1 | 93 | 55.8 ± 13.1 | 0.75 | |||
| Week 6 | 194 | 23.5 ± 16.4 | 84 | 30.2 ± 17.0 | 0.001 | 84.0% | 73.8% | 0.07 |
| Month 3 | 183 | 15.7 ± 16.5 | 82 | 22.1 ± 17.8 | 0.02 | 89.1% | 84.1% | 0.31 |
| Month 6 | 171 | 13.4 ± 15.5 | 74 | 16.9 ± 15.9 | 0.01 | 91.8% | 90.5% | 0.81 |
| Month 12 | 143 | 11.6 ± 13.7 | 65 | 16.9 ± 17.2 | <0.001 | 94.4% | 89.2% | 0.25 |
| Month 24 | 105 | 9.4 ± 14.5 | 43 | 21.1 ± 22.3 | <0.001 | 93.7% | 77.2% | 0.01 |
| P value‡ | <0.001 | <0.001 | ||||||
| VAS, low back pain | ||||||||
| Preop. | 206 | 68.6 ± 23.3 | 93 | 69.5 ± 22.2 | 0.75 | |||
| Week 6 | 194 | 18.5 ± 18.0 | 83 | 27.7 ± 25.3 | 0.001 | 83.5% | 68.7% | 0.009 |
| Month 3 | 183 | 16.2 ± 21.3 | 82 | 23.1 ± 24.5 | 0.02 | 83.6% | 79.3% | 0.39 |
| Month 6 | 171 | 14.7 ± 21.1 | 74 | 22.7 ± 24.8 | 0.01 | 86.0% | 79.7% | 0.26 |
| Month 12 | 143 | 12.4 ± 19.6 | 65 | 24.5 ± 27.6 | <0.001 | 86.0% | 76.9% | 0.11 |
| Month 24 | 105 | 11.1 ± 18.1 | 43 | 30.9 ± 33.1 | <0.001 | 84.4% | 61.8% | 0.01 |
| P value‡ | <0.001 | <0.001 | ||||||
| VAS, worst leg pain | ||||||||
| Preop. | 206 | 82.7 ± 13.5 | 93 | 85.1 ± 10.8 | 0.13 | |||
| Week 6 | 194 | 12.9 ± 20.5 | 84 | 17.9 ± 25.2 | 0.09 | 92.8% | 92.8% | 1.00 |
| Month 3 | 182 | 13.3 ± 22.5 | 82 | 15.9 ± 23.7 | 0.38 | 94.5% | 92.7% | 0.58 |
| Month 6 | 171 | 12.9 ± 22.7 | 74 | 17.0 ± 24.9 | 0.21 | 92.4% | 91.9% | 1.00 |
| Month 12 | 143 | 12.8 ± 22.0 | 65 | 18.7 ± 27.8 | 0.10 | 94.4% | 90.8% | 0.38 |
| Month 24 | 105 | 13.7 ± 24.2 | 43 | 23.3 ± 33.8 | 0.08 | 90.6% | 88.2% | 0.74 |
| P value‡ | <0.001 | <0.001 | ||||||
| ZCQ, symptom | ||||||||
| Preop. | 206 | 3.7 ± 0.6 | 93 | 3.7 ± 0.6 | 0.63 | |||
| Week 6 | 194 | 2.0 ± 0.7 | 84 | 2.1 ± 0.8 | 0.04 | 93.8% | 90.5% | 0.32 |
| Month 3 | 180 | 1.8 ± 0.7 | 81 | 2.0 ± 0.7 | 0.09 | 95.6% | 96.3% | 1.00 |
| Month 6 | 169 | 1.8 ± 0.7 | 74 | 1.9 ± 0.7 | 0.22 | 95.9% | 93.2% | 0.36 |
| Month 12 | 141 | 1.7 ± 0.7 | 63 | 2.0 ± 0.8 | 0.04 | 96.5% | 92.3% | 0.29 |
| Month 24 | 103 | 1.7 ± 0.8 | 41 | 2.2 ± 1.0 | 0.01 | 93.8% | 85.7% | 0.16 |
| P value‡ | <0.001 | <0.001 | ||||||
| ZCQ, physical | ||||||||
| Preop. | 206 | 2.9 ± 0.4 | 93 | 2.9 ± 0.4 | 0.50 | |||
| Week 6 | 194 | 1.7 ± 0.6 | 84 | 1.9 ± 0.6 | 0.01 | 86.7% | 76.2% | 0.04 |
| Month 3 | 180 | 1.5 ± 0.6 | 81 | 1.6 ± 0.6 | 0.11 | 91.2% | 91.5% | 1.00 |
| Month 6 | 169 | 1.4 ± 0.6 | 74 | 1.5 ± 0.5 | 0.26 | 90.6% | 91.9% | 1.00 |
| Month 12 | 141 | 1.4 ± 0.5 | 63 | 1.6 ± 0.7 | 0.001 | 96.5% | 84.6% | 0.01 |
| Month 24 | 103 | 1.4 ± 0.6 | 41 | 1.7 ± 0.8 | 0.02 | 92.7% | 82.9% | 0.11 |
| P value‡ | <0.001 | <0.001 | ||||||
| ZCQ, satisfaction | ||||||||
| Week 6 | 194 | 1.4 ± 0.5 | 84 | 1.6 ± 0.6 | 0.02 | 96.4% | 95.2% | 0.74 |
| Month 3 | 180 | 1.4 ± 0.6 | 81 | 1.5 ± 0.6 | 0.08 | 94.0% | 95.1% | 1.00 |
| Month 6 | 169 | 1.4 ± 0.6 | 74 | 1.4 ± 0.6 | 0.30 | 94.7% | 95.9% | 1.00 |
| Month 12 | 141 | 1.3 ± 0.5 | 63 | 1.6 ± 0.8 | 0.002 | 94.4% | 86.2% | 0.06 |
| Month 24 | 103 | 1.3 ± 0.6 | 41 | 1.7 ± 0.8 | 0.01 | 92.7% | 88.6% | 0.48 |
*
Continuous variables are given as the mean ± standard deviation. MCID = minimum clinically important difference, ODI = Oxford Disability Index, VAS = visual analog scale, ZCQ = Zurich Claudication Questionnaire.
†
Values are given as the mean ± standard deviation unless otherwise noted.
‡
Within-group comparison between preoperatively and 24 months postoperatively.