Question

what is the primary cause of narrowed lumbar spinal canals?
spondylosis
spinal tumor
congenital defect
disc herniation
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Explanation:

Spondylosis, a degenerative condition of the spinal vertebrae and discs, is the most common primary cause of narrowed lumbar spinal canals (spinal stenosis). It involves age-related changes like bone spurs, thickened ligaments, and disc degeneration that gradually narrow the spinal canal. The other options are less common or secondary causes.

Answer:

Spondylosis