One of the best-studied musculoskeletal problems is chronic neck pain.  The most common cause of chronic neck pain is facet joint disease. The facet joints are the small joints in the spine. They act as hinge joints, allowing flexion and resisting to an extent extension and rotation.  Facet joints can become "diseased" by a variety of means.  They are most commonly acutely injured in whiplash incidents. This can happen as a result of a motor vehicle accident, football injury, or other...