Radiologic Insights: Diagnosing Lumbosacral Transitional Vertebrae. Systematic Review of the Literature

The lumbosacral transitional vertebra (LSTV) has been studied since 1876, with Castellvi developing a classification in 1984 based on its anatomy and laterality. It often goes unnoticed, or its diagnosis is limited to a lumbar spine X‐ray for confirmation. This has led to LSTV being underdiagnosed or even ignored. Our aim is to describe and evaluate radiological diagnostic techniques for LSTV and propose a diagnostic methodology to reduce errors in vertebral level identification, useful for percutaneous procedures and/or biomechanical measurement analysis.