Straight leg raise
With the patient laying down on a table, the examiner lifts the patient's leg while the knee is straight.
If the examiner also dorsiflexes the foot, this is the Lasègue sign.
Another variation in the sitting position is the flip test. In this maneuver, the patient is asked to sit erect, without slumping.
Another variation in the sitting position is the slump test. In the Slump test:
- the patient sits looking straight ahead
- then is encouraged to slump in order to flex the thoracic and lumbar spines
- then fully flex the cervical spine, continuing to look straight ahead
- then the patient extends the leg at the knee
- then the examiner dorsiflexes the foot
|Straight leg raise||92% to 80%||28% to 40%|
|Crossed straight leg raise||28%||95%|
"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." 
If pain below the knee only occurs below the knee after more than 70°, this may indicate "sciatic nerve compression outside the spinal canal."
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