“ Mostly due to either degenerative disease (facet joint hypertrophy and slip) or, in 10%, pars defects (i.e. spondylolysis). It is commonl...
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Mostly due to either degenerative disease (facet joint hypertrophy and slip) or, in 10%, pars defects (i.e. spondylolysis).
It is commonly asymptomatic. Pars defects are thought to arise from microtrauma in childhood (e.g. gymnastics, etc.).
The defect in the pars contains fibrous material.
PLAIN FILM
• Scotty dog sign on oblique lateral, Napolean’s hat sign on AP
CT
• Displacement of the posterior margin of the vertebral body.
• Graded with the Meyerding scale (I—IV) for each 25% of slippage.
• Complete slippage so the body above lies below the superior end plate of the lower body is ‘spondyloptosis’.
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