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Changes of CSA in surgical levels
| Time point | Cross‐sectional area of the dural sac (mm2) | |||
|---|---|---|---|---|
| L2–L3 | L3–L4 | L4–L5 | Average value | |
| Preoperative | 130.60 ± 50.53 | 79.06 ± 30.50 | 84.39 ± 38.58 | 87.33 ± 39.41 |
| Final follow‐up | 155.10 ± 50.63 | 111.60 ± 33.66 | 126.10 ± 38.55 | 124.70 ± 39.26 |
| P | 0.0007 | 0.0001 | 0.0001 | 0.0001 |
