Isthmic spondylolisthesis is classified as which type and subtype in younger patients?

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The main concept tested here is Wiltse’s classification of spondylolisthesis, specifically the isthmic (pars interarticularis) form. In younger patients, slipping typically results from a defect in the pars interarticularis caused by a stress fracture from repetitive extension. This isthmic category is the second major type in Wiltse’s scheme. Within this group, the most common adolescent pattern is a bilateral pars defect that allows forward slippage of the vertebral body. That bilateral defect with slip is the classic presentation described for the youth group, which is why this scenario is labeled as the isthmic type with the youth-oriented subtype.