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Lumbarization & sacralization


  • 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.
Lateral radiograph of sacrum & lumbosacral junction
Lateral radiograph of sacrum & lumbosacral junction.




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