Which Wiltse type corresponds to iatrogenic origin?

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Wiltse’s system for pars interarticularis defects groups lesions by how they arise. When the origin is iatrogenic, meaning it’s caused by a medical procedure or instrumentation rather than by a congenital issue, repeated stress, or an acute injury, it belongs to the iatrogenic type. In practice this covers defects created during spine surgery or instrumentation that disrupt the pars interarticularis. Framing it this way helps distinguish iatrogenic lesions from congenital, stress-related, acute traumatic, or degenerative ones, which align with the other categories.