Straight leg raise
The straight leg raise, also called Lasègue's sign, Lasègue test or Lazarević's sign, is a test done during the physical examination to determine whether a patient with low back pain has an underlying herniated disk, often located at L5 (fifth lumbar spinal nerve).
With the patient lying down on his or her back on an examination table or exam floor, the examiner lifts the patient's leg while the knee is straight.
In order to make this test more specific, the ankle can be dorsiflexed and the cervical spine flexed. This increases the stretching of the nerve root and dura.
If raising the opposite leg causes pain (cross or contralateral straight leg raising):
- sensitivity 29%
- specificity 88%
Lasègue's sign was named after Charles Lasègue (1816-1883). In 1864 Lasègue described the signs of developing low back pain while straightening the knee when the leg has already been lifted. In 1880 Serbian doctor Laza Lazarević described the straight leg raise test as it is used today, so the sign is often named Lazarević's sign in Serbia and some other countries.
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- Rabin A, Gerszten PC, Karausky P, Bunker CH, Potter DM, Welch WC (2007). "The sensitivity of the seated straight-leg raise test compared with the supine straight-leg raise test in patients presenting with magnetic resonance imaging evidence of lumbar nerve root compression". Archives of physical medicine and rehabilitation 88 (7): 840–3. doi:10.1016/j.apmr.2007.04.016. PMID 17601462.
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- Devillé WL, van der Windt DA, Dzaferagić A, Bezemer PD, Bouter LM (2000). "The test of Lasègue: systematic review of the accuracy in diagnosing herniated discs". Spine 25 (9): 1140–7. doi:10.1097/00007632-200005010-00016. PMID 10788860.
- Lazarevićev znak (Croatian)