Straight leg raise: Difference between revisions
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* [[specificity (tests)|Specificity]] 26% | * [[specificity (tests)|Specificity]] 26% | ||
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* [[sensitivity (tests)|Sensitivity]] 29% | * [[sensitivity (tests)|Sensitivity]] 29% | ||
* [[specificity (tests)|Specificity]] 88% | * [[specificity (tests)|Specificity]] 88% | ||
Revision as of 13:59, 13 February 2013
Template:Search infobox Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Synonyms and keywords: Lasègue's sign; lasègue test
Overview
The straight leg raise is a test done during the physical examination to determine whether a patient with low back pain has an underlying herniated disk.
Historical Perspective
It was named after Charles Lasègue (1816-1883).
Technique
With the patient lying down on a table, the examiner lifts the patient's leg while the knee is straight.
A variation is to lift the leg while the patient is sitting.[1] However, this reduces the sensitivity of the test.[2]
Interpretation
"The straight leg raise test is positive if pain in the sciatic distribution is reproduced between 30° and 70° passive flexion of the straight leg." [3]
A meta-analysis reported the accuracy is:[4]
- Sensitivity 91%
- Specificity 26%
If raising the opposite leg causes pain (cross straight leg raising):
- Sensitivity 29%
- Specificity 88%
References
- ↑ Waddell G, McCulloch JA, Kummel E, Venner RM (1980). "Nonorganic physical signs in low-back pain". Spine. 5 (2): 117–25. PMID 6446157.
- ↑ 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.
- ↑ Speed C (2004). "Low back pain". BMJ. 328 (7448): 1119–21. doi:10.1136/bmj.328.7448.1119. PMID 15130982.
- ↑ 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. PMID 10788860.
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