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Form distribution of the L4–S1 coronal plane of the lumbar spine.
| Segment | Uniformly concave n (%) |
Asymmetric concave n (%) |
Flat-bottomed concave n (%) |
Flat type n (%) |
|---|---|---|---|---|
| L4 sup | 0 | 1 (3.0) | 19 (57.6) | 13 (39.4) |
| L4 inf | 21 (63.6) | 0 | 12 (36.4) | 0 |
| L5 sup | 2 (6.1) | 0 | 20 (60.6) | 11 (33.3) |
| L5 inf | 10 (30.3) | 0 | 23 (69.7) | 0 |
| S1 sup | 20 (60.6) | 0 | 13 (39.4) | 0 |
