Comparison of baseline demographics, surgical factors, sagittal alignment, and lower limb alignment between PNR and PR.
| Baseline Measures | Patient Group | P Value | |
| PNR (N = 29) | PR (N = 29) | ||
| Demographics | |||
| Age (y) | 64.4 ± 9.8 | 63.1 ± 12.6 | 0.668 |
| Sex (% female) | 62.1% | 72.4% | 0.401 |
| Body mass index (kg/m2) | 27.0 ± 7.2 | 29.0 ± 6.7 | 0.302 |
| Surgical factors | |||
| Fusion length (levels) | 10.8 ± 3.7 | 10.8 ± 4.3 | 0.974 |
| Any osteotomy (%) | 92.6% | 91.7% | 0.902 |
| Baseline sagittal alignment | |||
| Pelvic tilt (°) | 29.5 ± 6.0 | 29.2 ± 5.4 | 0.820 |
| Mismatch between pelvic incidence and lumbar lordosis (°) | 29.5 ± 15.9 | 30.9 ± 11.8 | 0.699 |
| Sagittal vertical axis (mm) | 98.1 ± 56.8 | 109.0 ± 50.3 | 0.448 |
| T4 T12 thoracic kyphosis (°) | −39.0 ± 21.3 | −29.7 ± 19.9 | 0.095 |
| T1 spinopelvic inclination (°) | 3.0 ± 7.1 | 4.8 ± 6.3 | 0.312 |
| Baseline lower limb alignment | |||
| Sacrofemoral angle (°) | 208.1 ± 8.2 | 204.2 ± 6.5 | 0.065 |
| Knee angle (°) | 8.7 ± 8.0 | 13.7 ± 8.9 | 0.043 |
| Ankle angle (°) | 7.1 ± 3.9 | 8.8 ± 4.6 | 0.172 |
| Pelvic shift (mm) | 76.7 ± 44.9 | 92.6 ± 55.6 | 0.267 |
| Global sagittal angle (°) | 10.2 ± 5.3 | 12.3 ± 5.8 | 0.180 |
Note: Data presented as mean ± SD or %. Bolded values indicate statistical significance at P < 0.05.
PNR, pelvic nonresponders; PR, pelvic responders.