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Spinal stenosis is the narrowing of spaces in the spine (backbone) which causes pressure on the spinal cord and nerves. About 75% of cases of spinal stenosis occur in the low back (lumbar spine).
Spinal stenosis is a progresive narrowing of the spinal canal that occurs most commonly in the cervical and lumbar areas.The prevalence of lumbar spinal stenosis is about 9.3%, with people in their 60s and 70s most commonly affected. Consensus criteria are needed to define and classify spinal stenosis. The means by which spinal stenosis is diagnosed is also changing. Concerns related to radiation risk of CT scans and the recognized limitations of spinal radiography suggest that MRI represents the best imaging modality in many cases. MRI helps avoid myelography and the associated risk and pain.