Note: Given the mechanism of SLR, active SLR should yield the same results as passive SLR. This test would then be repeated for the other side. For this reason, a positive finding for SLR assessment of sciatica requires referral into the lower extremity. If the sciatic nerve is already compressed in the intervertebral foramen (IVF) (or the central canal), then stretching it longer will pull it taut against the space-occupying lesion (bulging/herniated disc or bone spur), thereby increasing the referral symptoms into the lower extremity. This places a tensile force upon all posterior soft tissues, including the sciatic nerve, stretching them longer. Straight leg raise is performed by passively raising the lower extremity of the supine client/patient by flexing the thigh at the hip joint with the knee joint extended. Physical examination assessment of sciatica begins with straight leg raise (SLR).

Manual Therapy for the Low Back and Pelvis (2015). Straight leg raise orthopedic assessment test.

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Sciatica leg test