When we talk about spinal stenosis, we are essentially referring to a condition in which the spinal canal becomes narrower and there is a reduced amount of space for the nerves. This condition typically sets in as a result of acquired degenerative changes.
Think of the intervertebral disc as the tire of a car which gets deflated and sags over a period of time. When this happens, there is an overall loss of height to the spinal front. Also, the facet joints located at the back begin taking a greater amount of load. This ultimately results in the degeneration of the facet joint and the ligaments and joints might get inflamed and enlarged.