Updates in Degenerative Joint Disease of the Lumbar Spine.

Degenerative joint disease (DJD) of the lumbar spine represents a complex pathologic process influenced by mechanical stress, structural degeneration, and inflammatory changes rather than normal aging. Imaging features of lumbar DJD are outlined, with emphasis on the importance of recognizing pathologic changes that contribute to patient symptoms. Additionally, recent advancements in the understanding and imaging of DJD are discussed.