An iatrogenic cause of spondylolisthesis is which Wiltse classification?

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Wiltse’s system for spondylolisthesis etiologies groups slips by cause into six categories. The iatrogenic type refers to slips produced by medical intervention that destabilizes the spine—such as prior decompression or fusion procedures that alter the stability of the spinal segments. Other categories cover congenital/dysplastic, isthmic (pars interarticularis defect), traumatic, degenerative, and pathologic causes. Since an iatrogenic slip arises from medical treatment rather than a natural disease process, it is classified as Type Six.