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Spinal stenosis results from progressive narrowing of the central spinal canal and the lateral resesses.
Narrowing of the neural foramina of the spine, mainly cervical and lumbosacral, due to degenerative hypertrophy of the bony cartilaginous structures that delineate their contour.
Osteophytes and uncovertebral or degenerative joint hypertrophy, are the main cause of stenosis .
Bone spurs, or osteophytes, are bony projections that form along joints and cause narrowing or stenosis of the spinal cord.
When viewed from the side, the normal cervical spine curves slightly inward. This inward curve is called lordosis The stability of the cervical spine and its ability to stay in the lordotic position depends on other parts of the spine. The vertebral bodies need to be strong enough to support the head and keep the normal shape of the spine. The facet joints, ligaments, and soft tissues in the back of the neck and back must be strong. And the muscles in the back must be able to resist the effect of gravity pulling the head forward. If there is damage to any of these three areas, a kyphotic deformity can develop, and the weight of the head can cause reversal of the normal curvature of the spine.
Refer http://www.allaboutbackandneckpain.com/html/spinesub.asp?id=53
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