spondylolysis

A fracture (crack) in the ?pars interarticularis? where the vertebral body and the posterior elements, protecting the nerves are joined. In about 5% of the adult population, there is a developmental crack in one of the vertebrae, usually at the point at which the lower (lumbar) part of the spine (L5) joins the tailbone (sacrum). See section on spondylolysis and spondylolisthesis

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