Lasègue sign

Definition / Description

Lasègue sign, also known as Straight Leg Raise test (SLR) [[1]] is positive when there is a sensation of pain by applying pressure to the piriformis muscle and his tendon, particularly when the hip is flexed at an angle of 90 degrees and the knee is extended. The pain or tenderness is often localized in the vicinity of the greater sciatic notch. [[2],[3],[4]]


  1. Devillé Walter L. J. M. et al. The test of Lasègue : Systematic review of the Accuracy in Diagnosing Herniated Discs. Spine Nov 2000; 25 (9) : 1140-1147 (A1)
  2. Shah S,Wang TW. Piriformis syndrome. eMedicine specialities :Sports medicine : hip 2009fckLR
  3. Kirschner JS, Foye PM, Cole JL. Piriformis syndrome, diagnosis and treatment. Muscle Nerve Jul 2009 ; 40(1) : 10-18
  4. Lori A, Boyajian- O’ Neill et al. Diagnosis and Management of Piriformis syndrome : an osteopathic approach. The journal of the American and osteopathic association Nov 2008; 108(11): 657-664.