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The radiological intercristal line (Tuffier's line) usually intersects the spine at the L4-L5 interspace. The intercristal line determined by palpation may be used erroneously as a surrogate for the true radiological Tuffier's line. We studied term pregnant women to establish the level at which a transverse line connecting the superior aspects of the iliac crests, as determined by palpation, intersects the lumbar spine, as assessed by ultrasound.

The intercristal line determined by palpation is not a reliable anatomical landmark for neuraxial anesthesia