Degenerative spondylolisthesis corresponds to which type?

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Degenerative spondylolisthesis is the degenerative type. It happens when aging-related changes in the spine, especially wear-and-tear of the facet joints and disc degeneration, lead to instability and a vertebra slipping forward over the one below. This is different from a congenital malformation, a pars interarticularis defect, a traumatic fracture, or a disease-related bone condition, which correspond to the other categories. In short, the slip results from progressive degeneration of the joints and discs rather than an initial structural abnormality or acute injury.