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Distance at the location between “a” and “b”
| L2–3 (mm) | L3–4 (mm) | L4–5 (mm) | |
|---|---|---|---|
| MRI | 9.3 ± 2.9 | 8.1 ± 3.1 | 6.1 ± 2.7 |
| Standing | 5.5 ± 4.5*,# | 5.2 ± 4.0*,# | 5.8 ± 3.4 |
| Extension | 4.4 ± 2.0*,# | 4.7 ± 2.0*,# | 5.1 ± 4.9 |
| Flexion | 8.8 ± 5.8 | 9.8 ± 5.4 | 7.6 ± 4.9 |
* P < 0.05 compare with MRI; #P < 0.05 compare with flexion
