Radiographic intervertebral measurements.
| Parameter | Combined (N = 111) | Normal (LDI 50%–80%) (n = 81) | Hypolordotic (LDI <50%) (n = 14) | Hyperlordotic (LDI >80%) (n = 16) |
| L1−L2 IVL (°) | ||||
| Preoperative | 6.75 (3.67) | 7.02 (3.66) | 7.55 (3.68) | 4.34 (2.91) |
| Postoperative | 6.49 (3.38) | 6.43 (3.34) | 8.50 (3.60) | 4.85 (2.51) |
| Change | −0.18 | −0.49 | 1.28 | 0.19 |
| P | 0.603 | 0.246 | 0.106 | 0.817 |
| L2−L3 IVL (°) | ||||
| Preoperative | 8.62 (4.51) | 8.44 (4.08) | 11.81 (6.09) | 6.46 (3.79) |
| Postoperative | 8.34 (3.94) | 8.19 (3.86) | 11.46 (3.63) | 6.06 (2.83) |
| Change | −0.30 | −0.20 | −0.64 | −0.53 |
| P | 0.452 | 0.574 | 0.784 | 0.457 |
| L3−L4 IVL (°) | ||||
| Preoperative | 9.98 (4.42) | 10.01 (4.10) | 12.32 (5.71) | 7.42 (3.74) |
| Postoperative | 9.88 (4.42) | 10.09 (4.16) | 11.92 (4.68) | 6.66 (4.16) |
| Change | −0.05 | 0.08 | −0.27 | −0.61 |
| P | 0.878 | 0.832 | 0.820 | 0.472 |
| L4−L5 IVL (°) | ||||
| Preoperative | 9.57 (4.75) | 9.98 (4.92) | 7.95 (3.88) | 8.74 (4.33) |
| Postoperative | 10.54 (4.37) | 11.16 (4.55) | 8.75 (3.64) | 8.82 (2.99) |
| Change | 0.87 | 0.93 | 0.89 | 0.50 |
| P | 0.107 | 0.145 | 0.616 | 0.673 |
| L5−S1 IVL (°) | ||||
| Preoperative | 10.54 (6.35) | 11.07 (6.67) | 6.77 (4.23) | 11.22 (5.13) |
| Postoperative | 14.52 (4.82) | 15.12 (4.44) | 11.79 (5.43) | 13.95 (5.57) |
| Change | 4.27 | 4.24 | 5.62 | 3.12 |
| P | <0.001 | <0.001 | 0.021 | 0.098 |
Abbreviations: IVL, intervertebral lordosis; LDI, lordosis distribution index.
Note: Pre- and postoperative values are presented as mean (SD). Significant P values (<0.05) are shown in bold. Shaded areas represent levels treated with PIC, L4−L5, L5−S1, or L4−S1.