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. 2011 Nov 29;2011:414693. doi: 10.1155/2011/414693

Figure 1.

Figure 1

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.