Small synovial joints that are located between and behind adjacent vertebral bodies (vertebrae).  These joints run down the entire length of the spine in pairs on both sides of the spine.  The facet joints provide stability, support, and allow movements of the spine.   They also prevent detrimental movements that could injure the spinal cord.  They are found at every level of the spine, except the top level of the cervical spine.  It is common for facet joints to wear out or degenerate.