Thinking back on those pain-free days

The low back is comprised of five lumbar vertebrae and the soft tissue that supports them — namely the discs, cartilage, ligaments, muscles and tendons. There are built-in shock and friction absorbers in the form of spongy discs, and soft cartilage which prevent the vertebrae and the facet joints thereof, from rubbing together, while the ligaments and muscles keep the vertebrae properly aligned.