Spondylolisthesis occurs when one of the bones in the spine slips out of place. It is not the same as a slipped disc, which affects the tissue between the vertebrae, as opposed to the bones themselves. Spondylolisthesis is most common in the lower back and has multiple causes and treatments.
Degenerative spondylolisthesis is the most common type. The discs between the vertebrae become less spongy as we age and are unable to resist the movement of the spine as effectively. This makes it more likely that the discs will slip out of place. Degenerative spondylolisthesis is rare before age 50. Most cases are mild, and the progression of the displacement does not seem to correlate with the age of onset.
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