“…There is a worldwide consensus that spinal canal stenosis occurs mainly between the fifth and sixth decades of life, [5] these results are consistent with those of this and other investigations [6,7] and they are explained because as people age the ligaments of the spine thicken and harden (a process called calcification), bones and joints are deformed forming osteophytes and hernias or disc protrusions commonly appear, in addition to spondylolisthesis, all factors that lead to lumbar canal stenosis. [8] As observed in this and other studies, most lumbar canal stenoses begin with a segment, with L4-L5, followed by L5-S1, being the most affected because they are the ones that receive the most significant load and due to the accumulation of microtraumas, which favors the development of degenerative processes.…”