The ‘Wasserman’s sign’, also called ‘inverted or reversed Lasègue’s sign’, is a manoeuvre used in semeiotics to check for irritation of the nerve roots of the lumbar plexus (in particular the crural nerve and femoral nerve)

It can also be indicative of meningeal irritation.

How the Wasserman’s sign manoeuvre is performed

The patient lies in prone decubitus (on the stomach), with the legs outstretched the doctor lifts the thigh over the pelvis, with the knee flexed to 90°, until the hip is extended.

By stretching the crural nerve roots, if the patient feels pain in the lumbar region and along the innervation district, the sign is positive and indicates nerve root distress.

The pain may affect only the lumbar spine or it may radiate to the groin and thigh in the antero-medial region.

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Source:

Medicina Online