Which of the following is the most common level for degenerative spondylolisthesis?

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Degenerative spondylolisthesis happens when the disc loses height and the facet joints wear down, allowing one vertebra to slide forward over the one below. The slip most commonly occurs at the level where the lumbar spine experiences the greatest shear forces and where the facet joints are most oriented to permit forward translation when they degenerate—the junction between the fourth and fifth lumbar vertebrae. Because this level bears the most load and has facets that tilt in a way that favors forward movement as degeneration progresses, the upper vertebra tends to slip over the one beneath it, making that level the most frequent site. The other levels listed are less commonly affected because their anatomy provides more resistance to forward slip, or they’re at the lumbosacral junction where different biomechanics limit this process.