Straight Leg Raise (SLR) Test

The Straight Leg Raise (SLR) Test, also known as the Lasegue Test, is a fundamental neurological exam maneuver used to assess for lumbosacral nerve root irritation or compression—most commonly sciatic nerve involvement due to lumbar disc herniation. It is a core part of evaluating clients with low back pain, buttock pain, or radiating leg symptoms.

Straight Leg Raise (SLR) Test, Lasegue Test

How the Test is Performed

  • Client position: Supine (lying flat on the back) and relaxed.

  • The therapist passively lifts one straightened leg upward (hip flexion), keeping the knee fully extended.

  • The therapist notes the angle (usually between 30–70 degrees) at which symptoms begin.

  • A positive SLR test: Reproduction of the client’s typical leg pain/radiating symptoms (not just back pain) between 30–70 degrees of hip flexion.

  • If only back pain is triggered (no radiating symptoms), the test is considered negative for nerve root irritation.

  • Variations: Dorsiflexing the ankle or flexing the neck can increase nerve tension and test sensitivity.

Clinical Significance

  • A positive test suggests lumbosacral nerve root irritation or compression (commonly from lumbar disc herniation, but also possible with nerve root cysts, tumors, or severe stenosis).

  • The test is highly sensitive (72–97%), but not specific—other conditions can cause a positive result, such as hamstring tightness, facet cysts, or inflammation.

  • A similar test, the Crossed SLR Test, where symptoms are reproduced on the affected side when the opposite leg is raised, is less sensitive but more specific for nerve root irritation.

Assessment

  • Use SLR as part of a screen for clients presenting with low back pain, radiating buttock or leg pain, or suspected lumbosacral radiculopathy/sciatica.

  • Helps differentiate nerve root pain from musculoskeletal pain or joint dysfunction, guiding safe massage approaches.

Treatment

  • If positive: Avoid deep tissue or aggressive techniques to the lower back and gluteal muscles that could aggravate nerve irritation.

  • Focus on gentle soft tissue release, neuromuscular techniques, and pain-modifying strategies for surrounding muscles.

  • Educate clients on the importance of posture, activity modification, and avoiding provocative movements that cause radiating pain.

  • Collaboration with physiotherapists or spine specialists may be advisable for persistent or severe cases.

Safety and Referral

  • Refer clients for further medical evaluation or imaging if there is significant neurological involvement (weakness, numbness, bowel/bladder symptoms), persistent radiating pain, or a markedly positive SLR Test.

  • Document the angle and description of symptoms, and the side(s) affected, for multidisciplinary communication and tracking progress.