Which description best describes Type 2B in the Wiltse classification?

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This question hinges on how Wiltse distinguishes different forms of pars interarticularis changes in spondylolysis. Type 2B is the isthmic group that specifically describes an elongation of the pars interarticularis, rather than a discrete fracture. In this pattern, the pars is lengthened from repetitive stress, representing a chronic, elongated isthmus rather than an acute crack. That makes the description “isthmic due to elongation of the pars” the best fit, because it captures both the location (pars interarticularis) and the nature of the change (elongation, not a fracture). The other descriptions describe different processes: a pars fracture would be an acute break within the pars, while pathologic or degenerative labels point to non-isthmic disease processes not characterized by pars elongation.