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(English captions by Andrea Matsumoto from the University of Michigan)

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The Piriformis test evaluates for pain from[br]sciatic nerve irritation caused by piriformis

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muscle.

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With the patient prone, the knees are flexed[br]to 90 degrees and the hips are internally

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rotated.

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Provide resistance against external rotation.

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Reproduction of the pain is a positive test.