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Straight Leg Raise
Aka: Straight Leg Raise, Lasegue's Test, Lasegue's Sign, Test of Lasegue, Crossed Straight Leg Raise
- Technique
- Perform in two positions
- Supine Low Back Exam
- Sitting Low Back Exam
- Discrepancy between 2 positions suggests Malingering
- Flex hip from 180 to 90 degrees
- Interpretation: Criteria for positive test
- Sciatic Pain at 30 to 70 degrees
- Aggravation of pain dorsiflexion of the foot
- Relief of pain by knee flexion
- Interpretation: What patient experiences
- Radiating pain into the legs
- Suggests radiculopathy
- Higher likelihood findings suggesting radiculopathy
- Excruciating Sciatica-like pain
- Pain occurs at 30 to 40 degrees of leg elevation
- Pain radiates into opposite leg (Crossed Straight Leg Raise)
- Indicates severe impingement
- Almost always due to a large disk Herniation
- Modifications: Lasegue's Test
- Dorsiflex foot while performing Straight Leg Raise
- Efficacy: Predicting Lumbar Disc Herniation
- Straight Leg Raise
- Test Sensitivity: Up to 98%
- Test Specificity: Up to 61%
- Negative Likelihood Ratio: 0.2 (high Negative Predictive Value)
- Crossed Straight Leg Raise
- Test Sensitivity: Up to 43%
- Test Specificity: Up to 98%
- Positive Likelihood Ratio: 4.3 (high Positive Predictive Value)