What is SLR Test? The straight leg raise test is a neurodynamic test. The SLR is a neural tension test that can be used to determine whether neural tissue is involved in a space-occupying lesion, frequently a herniated lumbar disc. Technique: SLR is an inactive ( passive ) test. The normal leg is tested first before the other legs, one at a time. The patient is placed in a supine position without a pillow under his or her head, with the hip medially rotated and adducted and the knee extended, to perform the SLR test. While maintaining the knee in its fully extended position, the clinician raises the patient's leg by the posterior ankle. Up until the patient complains of pain or tightness in the back or back of the leg, the clinician keeps lifting the patient's leg by flexing at the hip. Reasoning: Acute dural inflammation, gluteal abscess, disc protrusion or extrusion, buttock tumor, and acute spondylosis are all possible causes of pain at less than 30 degrees of hip flexion