Radiographic information separated into pre- and postoperative alignment categories.
| Characteristics | Degrees, mean (SD; range) | Significancea P < 0.005 | |||
| Preserved n = 76 (56.3%) | Restored n = 23 (17.0%) | Not Corrected n = 29 (21.5%) | Worsened n = 7 (5.2%) | ||
| Preoperative | |||||
| Lumbar lordosis | 55.0 (10.1; 30–76) | 45.1 (13.8; 21–73) | 44.7 (11.2; 26–62) | 50.3 (17.8; 24–77) | <0.001 |
| Pelvic incidence | 54.0 (10.9; 36–83) | 61.4 (14.5; 41–88) | 64.7 (11.9; 42–83) | 53.3 (18.5; 33–85) | <0.001 |
| Spinopelvic alignment (PI–LL) | –1.0 (7.1; –18–10) | 16.3 (5.6; 10–30) | 20.0 (5.9; 11–32) | 3.0 (8.0; –13–9) | <0.001 |
| Postoperative | |||||
| Lumbar lordosis | 58.3 (11.1; 37–85) | 56.3 (13.5; 29–81) | 45.3 (12.2; 17–62) | 39.9 (16.7; 22–71) | <0.001 |
| Pelvic incidence | 55.4 (10.9; 37–84) | 60.6 (14.7; 38–88) | 65.1 (11.3; 42–84) | 55.8 (16.0; 42–84) | 0.003 |
| Spinopelvic alignment (PI–LL) | –2.9 (8.1; –29–9) | 4.3 (4.6; –9–10) | 19.8 (8.2; 10–42) | 15.9 (4.2; 12–23) | <0.001 |
| Change from baseline | |||||
| Lumbar lordosis | 3.3 (6.3; –10–22) | 11.2 (7.4; 2–32) | 0.5 (7.1; –21–21) | –10.4 (7.8; –25 to –2) | <0.001 |
| Pelvic incidence | 1.4 (2.9; –5–11) | –0.8 (3.4; –10–4) | 0.4 (3.8; –5–11) | 2.5 (3.6; –1–10) | 0.017 |
| Spinopelvic alignment (PI–LL) | –1.9 (6.5; –21–11) | –12.0 (6.9; –30 to –2) | –0.2 (7.0; –13–21) | 13.0 (8.2; 5–29) | <0.001 |
Abbreviations: LL, indicates lumbar lordosis; PI, pelvic incidence; PI–LL, pelvic incidence minus lumbar lordosis.
↵a One-way analysis of variance tests were used to categorize differences for each alignment measure between all 4 alignment groups.