Which Wiltse classification describes a spondylolisthesis due to pars involvement?

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Spondylolisthesis caused by a defect in the pars interarticularis is categorized as the isthmic type in Wiltse’s system. The hallmark of this type is a pars defect or stress fracture (spondylolysis) that allows the vertebral body to slip forward, often developing in young athletes. This pars involvement directly drives the listhesis, which is why this category is the best fit. Other Wiltse types describe different mechanisms—congenital or dysplastic abnormalities, degenerative facet joint changes in older adults, or acute traumatic fractures—that do not center on the pars interarticularis.