Thickening of the spinal ligaments inside the vertebral canal, leading to compressive forces on the spinal cord and spinal nerves. Lateral lumbar spinal canal stenosis:classification, pathologic anatomy and surgical decompression. The intervertebral foramen (lateral stenosis) Central stenosis involves narrowing of the spinal canal around the thecal sac containing the cauda equina, and occurs as a result of the facet joint arthrosis and hypertrophy, thickening and bulging of the ligamentum flavum, bulging of the intervertebral disc, or spondylolisthesis. 1997 Volvo Award winner in clinical studies. LSS may occur on a congenital narrow lumbar canal or may result from degenerative processes. This disorder usually involves the narrowing of one or two areas of the spine: 1. Lumbar canal stenosis, the most common form of spinal stenosis, causes neurogenic intermittent claudication and radiculopathy, and these symptoms dominate the clinical presentation. Spinal stenosis causes back pain and leg pain. Lumbar spinal stenosis (LSS) is a medical condition in which the spinal canal narrows and compresses the nerves and blood vessels at the level of the lumbar vertebrae.Spinal stenosis may also affect the cervical or thoracic region, in which case it is known as cervical spinal stenosis or thoracic spinal stenosis. SPINAL ( CANAL ) STENOSIS Overview of Spinal Stenosis Spinal stenosis is a narrowing of spaces in the spine that results in pressure on the spinal cord and/ or nerve roots. Lumbar spinal stenosis (LSS) is a common spinal condi-tion and the most frequent indication for spinal surgery in elderly people. The reduction in canal size may cause local neural compression and/or compromise of the blood supply to the cauda equina ... Microsoft PowerPoint - Spinal Stenosis.ppt Author: fuer03 This is a medical condition which usually occurs due to age-related changes and this may decrease the size of the canal. Most often it occurs when you walk. The prevalence of LSS is estimated to be 9% in the general population and up to 47% in people older than 60 years [1]. This may put pressure on the nerves and can cause pain, numbness, or weakness in your buttocks, legs, or feet. 1 The narrowing may not cause any symptoms. Stenosis in the spine is the narrow-ing of the bony canal that surrounds the nerves. It may result from trauma or as a normal part of aging. Rationale for spinal fusion in lumbar spinal stenosis . The lumbar canal stenosis is a condition which indicates the narrowing of your spinal canal or the tunnels through which your nerves and other body parts communicate with the canal. Stenosis in the lumbar spine may be diagnosed if degenerative changes have narrowed the bony openings of the spine and affected the nervous tissues, such as the spinal nerves, spinal cord, and/or the cauda equina. 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