Which test variation is used to assess contralateral nerve root tension and is a variation of the straight-leg raise?

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Testing contralateral nerve root tension is done with a crossed straight-leg raise. In this variation of the straight-leg raise, you lift the opposite leg while the other remains flat; if the opposite leg’s lifting reproduces radicular symptoms in that leg, it indicates tension of the contralateral nerve roots. This uses the same setup as the standard straight-leg raise but targets the opposite side to stress the contralateral roots. The standard straight-leg raise assesses tension on the leg being lifted, while Spurling's test checks cervical nerve root compression, and Kernig sign evaluates meningeal irritation rather than limb nerve tension.