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To the Editor:—
The following test is useful in early and suspected cases of sciatic neuropathy. Many patients are surprised to discover, from this test, that so much functional involvement has already occurred.The patient supports his entire weight on the toes of each foot, separately. At the same time he raises the heel of the supporting foot maximally. If there is affectation of the sciatic nerve, he will experience much difficulty, which will be obvious when compared with the ability to support his weight on the normal side.The sciatic nerve is presumably stretched by the hyperextension, and simultaneously compressed throughout its length by the tensed and taut muscles surrounding it. The test is executed during a moment of maximal functional activity. I have found this test most sensitive to the early detection of sciatic neuropathy.
Whitehill LA. The Lasègue Test. JAMA. 1967;201(8):641. doi:10.1001/jama.1967.03130080083033
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