Postoperative mean angular motion at adjacent levels.
| Investigational (N = 280) | Control (N = 265) | |||||
|---|---|---|---|---|---|---|
| N | Mean±SD | P value | N | Mean±SD | P value | |
| 1.5 months | ||||||
| Change in angulation at the segment above (°) | 266 | -0.77±3.61 | <0.001 | 187 | -1.13±4.39 | <0.001 |
| Change in angulation at the segment below (°) | 172 | -0.25±3.17 | 0.298 | 86 | 0.70±3.67 | 0.081 |
| 3 months | ||||||
| Change in angulation at the segment above (°) | 264 | 0.32±3.85 | 0.175 | 194 | 0.06±4.27 | 0.841 |
| Change in angulation at the segment below (°) | 174 | 0.29±3.48 | 0.266 | 91 | 1.21±3.71 | 0.002 |
| 6 months | ||||||
| Change in angulation at the segment above (°) | 263 | 0.82±3.84 | <0.001 | 198 | 0.53±4.26 | 0.084 |
| Change in angulation at the segment below (°) | 166 | 0.65±3.69 | 0.025 | 94 | 0.99±3.93 | 0.017 |
| 12 months | ||||||
| Change in angulation at the segment above (°) | 267 | 1.27±3.75 | <0.001 | 188 | 1.32±4.41 | <0.001 |
| Change in angulation at the segment below (°) | 166 | 1.11±3.47 | <0.001 | 95 | 1.89±4.50 | <0.001 |
| 24 months | ||||||
| Change in angulation at the segment above (°) | 262 | 1.88±3.84 | <0.001 | 187 | 1.04±4.60 | 0.002 |
| Change in angulation at the segment below (°) | 161 | 1.13±3.75 | <0.001 | 94 | 1.28±4.28 | 0.005 |
| 36 months | ||||||
| Change in angulation at the segment above (°) | 225 | 1.53±3.92 | <0.001 | 139 | 0.20±5.30 | 0.639 |
| Change in angulation at the segment below (°) | 143 | 1.69±3.83 | <0.001 | 67 | 0.74±4.52 | 0.187 |
| 60 months | ||||||
| Change in angulation at the segment above (°) | 188 | 1.37±3.99 | <0.001 | 159 | -0.17±4.79 | 0.663 |
| Change in angulation at the segment below (°) | 117 | 1.11±4.37 | 0.007 | 75 | 0.85±4.95 | 0.143 |
| 84 months | ||||||
| Change in angulation at the segment above (°) | 194 | 1.06±4.39 | <0.001 | 152 | -0.23±5.37 | 0.604 |
| Change in angulation at the segment below (°) | 127 | 1.25±4.06 | <0.001 | 70 | 1.25±5.07 | 0.043 |