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To evaluate the reliability, sensitivity, specificity and positive (PPV) and negative (NPV) predictive values for the diagnosis of sciatica associated with disc herniation of the bell test (BT) and the hyperextension test (HT).

british journal of rheumatology

Value of the bell test and the hyperextension test for diagnosis in sciatica associated with disc herniation: comparison with Lasegue's sign and the crossed Lasegue's sign