Which Wiltse type corresponds to traumatic origin?

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In Wiltse’s classification of pars interarticularis injuries, the category that denotes an acute, single-event fracture is the traumatic-type. It specifically captures injuries caused by a one-time impact or abrupt hyperextension, rather than by repetitive stress, congenital malformation, or gradual changes. So, when the origin is traumatic, this is the type that fits best. Clinically you’d expect a sudden onset of localized back pain after an event, and imaging would typically show a new, crisp fracture line through the pars interarticularis. The other categories describe congenital (dysplastic), stress-related (fatigue) fractures, or elongated pars changes, which don’t reflect a single-trauma origin.