BOWSTRING TEST FOR LUMBOSACRAL RADICULAR PAIN Another less common test you can perform in order to confirm/reject radicular pain due to a lumbar disc herniation is the Bowstring test, also known as Cram test or Posterior Tibial Nerve Sign. This test is a modification of the Straight Leg Raise test and indicates pressure or tension on the sciatic nerve. Then the patient's complaints are reproduced in a position with slight knee flexion (20°) with pressure on the tibial nerve. Have you ever used t