The Scotty dog sign on oblique lumbar radiographs indicates fracture of which structure?

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Prepare for the Medbridge Orthopedic Clinical Specialist Test. Test your knowledge with multiple choice questions, each featuring hints and explanations. Ace your exam with ease!

Multiple Choice

The Scotty dog sign on oblique lumbar radiographs indicates fracture of which structure?

Explanation:
On oblique lumbar radiographs, the Scotty dog sign helps identify a fracture of the pars interarticularis. The neck of the Scotty dog represents this region, and when a pars interarticularis fracture occurs, it appears as a “collar” around that neck—the collar sign. This is the classic indicator of pars interarticularis fracture (spondylolysis). The other structures (pedicle, lamina, vertebral body) do not produce the collar sign on the oblique view, so they are not linked to this radiographic finding.

On oblique lumbar radiographs, the Scotty dog sign helps identify a fracture of the pars interarticularis. The neck of the Scotty dog represents this region, and when a pars interarticularis fracture occurs, it appears as a “collar” around that neck—the collar sign. This is the classic indicator of pars interarticularis fracture (spondylolysis). The other structures (pedicle, lamina, vertebral body) do not produce the collar sign on the oblique view, so they are not linked to this radiographic finding.

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