Figure 1From: Does lumbar spinal degeneration begin with the anterior structures? A study of the observed epidemiology in a community-based population Prevalence of Patterns of Spinal Degeneration by Age Group (Definition 1)*. *Anterior degeneration: at least moderate disk height loss at L2-S1; posterior degeneration: at least moderate facet joint osteoarthritis at L2-S1.Back to article page