Lumbarization of S1 vertebra

Case contributed by Mohammad Osama Hussein Yonso
Diagnosis certain


History of back pain after lifting heavyweight. Physical Exam: conscious, oriented, cooperative, afebrile, paralumbar tenderness.

Patient Data

Age: 30 years
Gender: Male
  • Both Sacro-iliac joints appear normal, partial lumbarization of S1  
  • Minimal lumbar scoliosis curvature to the right side at the AP view.
  • Mild straight lumbar spine 
  • I.V. disk spaces appear normal 
  • Mild spondylotic changes are seen in the lumbar spine
  • No compression fracture or wedging is seen.
  • No clear spondylolisthesis is seen. 

Case Discussion

Lumbarization of S1 is :

  • assimilation of S1 to the lumbar spine partially (unilateral) or completely (bilateral).
  • less common than sacralization, occurring in ~2% of the population 2
  • presence of six rib-free lumbar-type vertebrae

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