SLR Test (Straight Leg Raise Test): Technique, Reasoning, Modification

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.

A lumbar disc herniation at the L4-S1 nerve roots is suggestive of neurological pain that occurs in the leg and low back when the hip is flexed between 30 and 70 degrees.

Hip pain at an angle of hip flexion greater than 70 degrees may be caused by tight hamstrings, a pathological hip or SI joint (>90), or it may be the result of tight gluteus maximus, hip capsule, or hamstrings.

Modifications:

SLR (Basic):

This test is used to test the sciatic and tibial nerve.

Position of limb:

Hip in flexion and adduction, Knee in extension, Ankle in dorsiflexion.

SLR2:

This test is used to test tibial nerve.

Position of limb:

Hip in flexion, Knee in extension, Ankle in dorsiflexion, foot in eversion, toes on extension

SLR3:

This test is used to test sural nerve.

Position of limb:

Hip in flexion, Knee in extension, Ankle in dorsiflexion, Foot in inversion.

SLR4:

This test is used to test common peroneal nerve.

Position of limb:

Hip in flexion and medial rotation, Knee in extension, Ankle in planter flexion, Foot in inversion

SLR5 (Cross leg):

This test is used to test nerve root compression and disc prolapse.

Position of limb:

Hip in flexion, Knee in extension, Ankle in dorsiflexion

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