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a Mean lordosis angle in plain scans and b mean sagittal range of motion (ROM) in flexion–extension scans
| Pre-OP | 2 years | P value | |
|---|---|---|---|
| a Plain (°) mean ± SD | |||
| L1–5 (°) | 28.6 ± 11.5 | 27.8 ± 12.1 | 0.283 |
| L3–4 (°) | 6.4 ± 3.7 | 8.0 ± 3.5 | 0.032 |
| L4–5 (°) | 7.8 ± 3.1 | 5.7 ± 2.4 | <0.0001 |
| b ROM (°) mean ± SD | |||
| L1–5 (°) | 15.8 ± 10.4 | 21.1 ± 11.8 | 0.006 |
| L3–4 (°) | 2.0 ± 2.6 | 4.8 ± 4.2 | 0.031 |
| L4–5 (°) | 4.6 ± 2.8 | 2.6 ± 1.5 | 0.003 |
