Retrospective Cohort Study of the Prevalence of Lumbosacral Transitional Vertebra in a Wide and Well-Represented Population

<table>Types of the Castellvi radiographic classification system. (Ia) Case number 1746. (Ib) Case number 312. (IIa) Case number 1021. (IIb) Case number 1290. (IIIa) Case number 1075. (IIIb) Case number 1330. (IV) Case number 1988.</table>

Arthritis

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Figure 1

Figure 1: Retrospective Cohort Study of the Prevalence of Lumbosacral Transitional Vertebra in a Wide and Well-Represented Population 