Type I Congenital/Dysplastic Spondylolisthesis is commonly caused by which condition?

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Type I congenital/dysplastic spondylolisthesis is driven by a developmental malformation at the lumbosacral junction. It stems from a congenital anomaly in the formation or segmentation of the vertebrae and posterior elements, which predisposes the spine to forward slippage during growth. This is different from a fracture of the pars interarticularis (which causes isthmic spondylolisthesis), from trauma, or from degenerative changes in facet joints (seen with aging). So, the slip arises from a congenital/ developmental defect rather than an acquired fracture or degenerative process, making congenital anomaly the correct cause.