What finding constitutes a positive straight leg raise test?

What finding constitutes a positive straight leg raise test?

• A. Pain with hip flexion at 10 degrees.
• B. Pain with hip flexion at 30-40 degrees.
• C. Pain with hip flexion between 40 and 70 degrees.
• D. Pain only at knee flexion.

Answer: (C)

The straight leg raise is used to tension the lumbosacral nerve roots and provoke radicular symptoms if a disc herniation compresses these nerves. A positive test is when leg raising while the knee is straight reproduces sciatic-type pain that radiates below the knee, consistent with nerve root irritation from the lumbar spine. Pain that appears in the midrange of hip flexion—typically around 40 to 70 degrees—fits this pattern best. This midrange is where enough nerve tension is applied to reveal radiculopathy without being confounded by simple hamstring tightness (which tends to cause pain at very low angles, near or below 30 degrees) or by nonradicular sources of pain that may occur with higher degrees of hip flexion. Therefore, pain reproduced in this midrange supports a positive test for lumbar nerve root irritation. Pain confined to knee flexion or occurring only at very low angles is less suggestive of radiculopathy, and pain only at very high angles may reflect other issues such as hip joint or facet problems rather than nerve root tension.

The straight leg raise is used to tension the lumbosacral nerve roots and provoke radicular symptoms if a disc herniation compresses these nerves. A positive test is when leg raising while the knee is straight reproduces sciatic-type pain that radiates below the knee, consistent with nerve root irritation from the lumbar spine.

Pain that appears in the midrange of hip flexion—typically around 40 to 70 degrees—fits this pattern best. This midrange is where enough nerve tension is applied to reveal radiculopathy without being confounded by simple hamstring tightness (which tends to cause pain at very low angles, near or below 30 degrees) or by nonradicular sources of pain that may occur with higher degrees of hip flexion. Therefore, pain reproduced in this midrange supports a positive test for lumbar nerve root irritation.

Pain confined to knee flexion or occurring only at very low angles is less suggestive of radiculopathy, and pain only at very high angles may reflect other issues such as hip joint or facet problems rather than nerve root tension.