Which condition would not typically produce a positive straight leg raise test?

• A. Spinal stenosis
• B. Lateral disc herniation
• C. Scoliosis
• D. Large central disc herniation

Answer: (C)

The straight leg raise tests nerve-root tension in the lumbar spine, specifically assessing for radicular pain from compression of a lumbar nerve root (often L5-S1) when the sciatic nerve is stretched by lifting the straight leg. When a posterolateral disc herniation or spinal stenosis narrows the space around a nerve root, this tension reproduces typical radiating leg pain, usually below the knee, because the affected nerve root is irritated. A large central disc herniation can also irritate multiple nerve roots or thecal sac contents, leading to pain with leg elevation in many cases. Scoliosis, however, is a structural curvature of the spine and does not inherently irritate a single nerve root in a way that reliably reproduces radicular symptoms with a straight leg raise. Its symptoms are more related to altered biomechanics and potential secondary issues, not a focal radicular pain pattern produced by nerve root tension. So scoliosis would not typically yield a positive straight leg raise, whereas the other conditions commonly do.