- Transitional vertebrae: 25% of normal cases.
- Sacralization of lumbar body: Spectrum from expanded transverse processes of L5 vertebra articulating with top of sacrum to incorporation of L5 vertebra into sacrum.
- Lumbarization of sacrum: Elevation of S1 vertebra above sacral fusion mass assuming lumbar body shape.
- Sacrum lies at 40° incline from horizontal at lumbosacral junction.
- Lumbarization & sacralization may appear similar that requires counting from C2 caudally to precisely define anatomy.
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| Lateral radiograph of sacrum & lumbosacral junction. |
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