Back pain with a positive crossed straight leg test and diminished reflexes is most consistent with which diagnosis?

Back pain with a positive crossed straight leg test and diminished reflexes is most consistent with which diagnosis?

• A. Herniated Disc
• B. Spinal Stenosis
• C. Spondylolisthesis
• D. Osteoarthritis

Answer: (A)

A lumbar disc herniation is suggested when back pain comes with nerve-root–specific signs, and a crossed straight-leg raise is particularly telling. This test becomes positive when lifting the opposite leg reproduces pain in the leg on the side of the herniation, indicating that a disc fragment is compressing or irritating a nerve root. The presence of diminished reflexes fits with radiculopathy from that same nerve root compression, adding anatomical confirmation that the issue is a nerve-root problem rather than purely joint or spinal canal narrowing. Spinal stenosis, while it can cause back and leg symptoms, typically presents with neurogenic claudication—leg cramping or weakness that worsens with walking and improves with bending forward or sitting—rather than a classic positive crossed straight-leg raise. Spondylolisthesis can cause radicular symptoms too, but exam findings often include a palpable vertebral step-off and may have a different pattern of nerve involvement. Osteoarthritis of the spine tends to cause axial back pain with less pronounced radicular signs and a non-specific positive straight-leg raise is less characteristic. So the combination of back pain, a positive crossed straight-leg test, and diminished reflexes most strongly points to a herniated disk causing radiculopathy.

A lumbar disc herniation is suggested when back pain comes with nerve-root–specific signs, and a crossed straight-leg raise is particularly telling. This test becomes positive when lifting the opposite leg reproduces pain in the leg on the side of the herniation, indicating that a disc fragment is compressing or irritating a nerve root. The presence of diminished reflexes fits with radiculopathy from that same nerve root compression, adding anatomical confirmation that the issue is a nerve-root problem rather than purely joint or spinal canal narrowing.

Spinal stenosis, while it can cause back and leg symptoms, typically presents with neurogenic claudication—leg cramping or weakness that worsens with walking and improves with bending forward or sitting—rather than a classic positive crossed straight-leg raise. Spondylolisthesis can cause radicular symptoms too, but exam findings often include a palpable vertebral step-off and may have a different pattern of nerve involvement. Osteoarthritis of the spine tends to cause axial back pain with less pronounced radicular signs and a non-specific positive straight-leg raise is less characteristic.

So the combination of back pain, a positive crossed straight-leg test, and diminished reflexes most strongly points to a herniated disk causing radiculopathy.