Which imaging view is most commonly used to visualize the pars interarticularis in the lumbar spine?

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Visualizing the pars interarticularis is easiest on an oblique lumbar radiograph because this projection angles the spine so the pars region sits in profile between the facet joints, reducing overlap with surrounding structures. In this view, the pars interarticularis is seen as the “neck” area of the so‑called Scottie dog; a fracture appears as a break in that neck—the classic collared dog sign—making spondylolysis easier to detect. Other views tend to obscure the pars: the AP view has superimposition from the pedicles and lamina, the lateral view projects elements in a way that can hide small fractures, and flexion-extension views focus on instability rather than anatomy. Thus, the oblique projection is the standard choice for clearly visualizing the pars interarticularis in the lumbar spine.