TABLE 3.
Comparisons of preoperative parameters between subsidence group and non‐subsidence group
| Preoperative parameter | Non‐subsidence (n = 68) | Subsidence (n = 45) | p‐value |
|---|---|---|---|
| Number of levels | 68 | 45 | |
| Lumbar lordosis (°) | |||
| Mean (SD) | 36.5 (4.9) | 37.9 (2.6) | 0.409 |
| Segmental lordosis (°) | |||
| Mean (SD) | 7.4 (1.0) | 7.5 (1.2) | 0.619 |
| SCD (mm) | |||
| Mean (SD) | 11.5 (0.9) | 11.4 (1.0) | 0.885 |
| Foraminal height (mm) | |||
| Mean (SD) | 14.3 (1.9) | 14.0 (1.9) | 0.455 |
| QCT‐BMD | |||
| Mean (SD) | 108.6 (34.6) | 96.9 (39.4) | 0.019 |
| Category (%) | 0.816 | ||
| Normal | |||
| >120 mg/cm3 | 22 (32.4) | 11 (24.4) | |
| Osteopenia | |||
| 80–120 mg/cm3 | 29 (42.6) | 12 (26.7) | |
| Osteoporosis | |||
| <80 mg/cm3 | 25 (36.8) | 14 (32.1) | |
| P‐TB‐vBMD (mg/cm3) | |||
| Mean (SD) | 118.7 (38.2) | 101.9 (37.3) | 0.022 |
| TB‐vBMD (mg/cm3) | |||
| Mean (SD) | 119.9 (36.3) | 108.8 (37.1) | 0.035 |
| 1.25‐mm EP‐vBMD (mg/cm3) | |||
| Mean (SD) | 331.0 (66.1) | 289.2 (76.1) | 0.002 |
Abbreviation: SCD, sagittal canal diameter.