Facet joint syndrome can be a cause of low back pain. Facet joints are the the joints in the back and neck that link together the vertebra. Sometimes these joints can become stiff and lead to decreased movement, this in turn can cause irritation to the joints and this is when it becomes painful.
The primary symptom of facet syndrome is back pain or neck pain. If you have back pain and it is made worse when bending backwards then this could possibly be indicative of facet syndrome. Similarly if the pain is in your neck pain and is made worse by extending your neck (looking up).
Treatment for this type of back pain would usually involve manipulation. This will help restore some of the movement and decrease the pain.