What is lumbar spinal stenosis? Lumbar spinal stenosis is a narrowing of the spinal canal in the lower back (lumbar spine). The spinal canal houses the spinal cord and nerves. The narrowing caused by ...

Lumbar spinal stenosis (LSS) is the narrowing of the central canal and, often, the lateral recess due to facet joint hypertrophy, thickening and bulging of the ligamentum flavum, bulging of an ...