PMC3350074_01
The stork test involves asking the patient to stand on one leg and to extend the low back. Pain indicates possible spondylolysis on the ipsilateral side. When properly done (a), the leg is straight and trunk tilt results from lumbosacral extension. Note that concurrent ipsilateral knee flexion (b) may produce trunk tilt without low back extension and subsequently produce lower test sensitivity.
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PMC3350074_01_CRIM.PEDIATRICS2011-414693.001.jpg
fig1
Provocative tests revealed reproduction of pain with one-leg standing and concordant low back extension (stork test) (Figure 1).
Hyperlucency seen at the L5 pars interarticularis is suggestive of fracture.
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PMC3350074_01_CRIM.PEDIATRICS2011-414693.002.jpg
fig2
Given the positive stork test, coronal and lateral roentgenograms of the spine were obtained, revealing hyperlucency at the L5 pars interarticularis suggestive of bilateral fractures of the pars interarticularis (Figure 2).