Lumbar arthritis: What you need to know
When arthritis affects the lower back, this is known as lumbar arthritis. The most common cause of lumbar arthritis is osteoarthritis (OA). The spine is divided into five sections — the cervical, thoracic, lumbar, sacrum, and coccyx. Lumbar arthritis affects the lumbar portion of the spine, or lower back, which is situated just above the pelvis.