Which Wiltse type corresponds to degenerative origin?

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Wiltse’s classification groups pars interarticularis defects by their cause. The degenerative form is the one that arises from aging-related wear-and-tear of the spinal structures, rather than from a congenital anomaly, a fatigue fracture from repetitive use, acute trauma, or a pathologic lesion. In this degenerative type, changes like facet joint degeneration and general wear lead to a gradual pars defect over time. That’s why this category best fits degenerative origin. The other etiologies—congenital dysplasia, stress-related fatigue fractures, traumatic fractures, and pathologic processes—have their own distinct categories, but they are not the degenerative type.