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Form distribution of the L4–S1 sagittal endplate of the lumbar spine.
| Segment | Uniformly concave n (%) |
Asymmetric concave n (%) |
Flat-bottomed concave n (%) |
Flat type n (%) |
|---|---|---|---|---|
| L4 sup | 9 (27.3) | 7 (21.2) | 7 (21.2) | 10 (30.3) |
| L4 inf | 15 (45.5) | 9 (27.3) | 7 (21.2) | 2 (6.1) |
| L5 sup | 2 (6.1) | 17 (51.5) | 3 (9.1) | 11 (33.3) |
| L5 inf | 8 (24.2) | 18 (54.5) | 2 (6.1) | 5 (15.2) |
| S1 sup | 0 | 3 (9.1) | 1 (3.0) | 29 (87.9) |
