Table 4.
Retrospective comparison of radiographic parameters between cases with nerve root injury and true-negative cases
| Variable | Cases with nerve root injury (n=7) | True-negative cases (n=248) | p-value |
|---|---|---|---|
| Preoperative parameters | |||
| SVA (mm) | 108.6±48.7 | 98.5±88.6 | 0.766 |
| TK (°) | 29.4±29.4 | 25.9±20.5 | 0.657 |
| LL (°) | 3.9±17.2 | 19.3±26.4 | 0.125 |
| PT (°) | 38.0±5.7 | 29.8±13.4 | 0.007 |
| PI (°) | 47.6±6.7 | 51.2±11.8 | 0.415 |
| SS (°) | 9.6±8.0 | 21.4±13.6 | 0.023 |
| PI–LL (°) | 43.7±15.4 | 31.9±26.8 | 0.249 |
| Cobb angle (°) | 25.3±25.3 | 33.6±23.8 | 0.367 |
| C7-CSVL (mm) | 25.1±43.0 | 29.1±31.9 | 0.748 |
| Postoperative parameters (early postoperatively) | |||
| SVA (mm) | 46.8±40.9 | 40.9±50.5 | 0.778 |
| TK (°) | 32.8±9.0 | 33.5±12.2 | 0.889 |
| LL (°) | 44.2±13.7 | 42.6±12.8 | 0.762 |
| PT (°) | 14.8±5.2 | 20.2±9.1 | 0.155 |
| PI (°) | 48.7±9.5 | 51.1±10.9 | 0.589 |
| SS (°) | 33.8±8.1 | 30.9±9.1 | 0.431 |
| PI–LL (°) | 4.5±7.8 | 8.6±13.8 | 0.474 |
| Cobb angle (°) | 10.1±16.1 | 10.6±10.5 | 0.906 |
| C7-CSVL (mm) | 27.5±24.7 | 18.1±18.2 | 0.748 |
| Amount of change (postoperative–preoperative value) | |||
| SVA (mm) | 71.8±58.2 | 57.9±84.5 | 0.689 |
| LL (°) | 40.3±19.2 | 23.0±25.4 | 0.099 |
| PT (°) | 21.5±5.0 | 9.4±12.1 | 0.001 |
| Cobb angle (°) | 15.1±13.5 | 23.6±17.6 | 0.209 |
Values are presented as mean±standard deviation.
SVA, sagittal vertical axis; TK, thoracic kyphosis; LL, lumbar lordosis; PT, pelvic tilt; PI, pelvic incidence; SS, sacral slope; C7-CSVL, C7 central sacral vertical line.