Optimum vertebral level of LSTV by LSTV type based on the reference ranges of pelvic incidence and pelvic tilt.
| Optimum Vertebral Level of LSTV | Type IIIa (n = 9) | Type IIIb (n = 44) | Type IV (n = 3) | n = 56 |
| LSTV = lowest lumbar vertebra | 5 | 7 | 2 | 14 (25.0%) |
| LSTV = S1 | 1 | 27 | 1 | 29 (51.8%) |
| LSTV = intermediate | 3 | 10 | 0 | 13 (23.2%) |
Abbreviations: LSTV, lumbosacral transitional vertebra.