A defect in the pars interarticularis of the neural arch that connects the superior and inferior articular facets, leading to back pain and spondylolisthesis
. Thought to be secondary to both hereditary factors such as spina bifida occulta
and repeated microtrauma to the back. 95% of spondylolysis occurs at the L5 level.
M43.00 – Spondylolysis, site unspecified
240221008 – Spondylolysis