Lasègue sign is one of the so-called ‘meningeal signs’, i.e. a group of signs used in neurological semeiotics to detect possible pathological processes of the meninges

The positivity of this sign helps the physician make a diagnosis of meningitis.

Lasègue’s sign is, along with Brudzinski’s sign, Kernig’s sign, spinal tap (lumbar puncture) and haemochrome (blood test), one of the main methods of diagnosing meningitis, but it is also used to diagnose other types of damage that cause irritation of the meninges.

It is named after the French physician Ernest-Charles Lasègue who identified it in the 1800s.

How the manoeuvre for Lasègue sign is performed

The patient lies in a supine position. The doctor tries to flex the thigh over the pelvis with the leg extended, but around 60° of flexion the patient reports feeling a sharp pain caused by the stretching of the sciatic nerve radiating to the spine.

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Source:

Medicina Online