Type I spondylolisthesis is commonly referred to as which of the following?

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Classification by cause shows that the first type is dysplastic spondylolisthesis, due to congenital dysplasia at the lumbosacral junction, such as anomalous development of the sacrum or facet joints that predisposes to anterior slippage. This is why it’s labeled as dysplastic. The other types reflect different mechanisms: an isthmic slip comes from a pars interarticularis defect (stress fracture), a degenerative slip from facet joint degeneration in older adults, and a traumatic slip from a fracture elsewhere in the vertebra, with a separate category for bone-disease–related pathology.