The two most common causes of chronic low back pain are
Facet joint injury or osteoarthritis
Sacroiliac joint dysfunction or osteoarthritis.
The facet joints are small joints in the spine which is where motion in the spine occurs. The discs are cushions in the front of the spine that do not move and are infrequent sources of pain. The facet joints are located on each side of the spine and occur in pairs at each level from C1-2 in the upper neck to L5S1 in the lower back. A...