Flexion-distraction is one of the most well-studied chiropractic procedures. It has been shown to be effective for the treatment of disc herniation, degenerative disc disease and spinal stenosis as well as spinal subluxations. Numerous studies have also shown this procedure to be effective in treating the neck (cervical spine). Disc pathology (slipped and degenerative discs) in the neck can cause neck, upper back, shoulder and arm pain and numbness. Federally funded studies continue to be performed to help document the physiological mechanisms resulting in the clinical successes demonstrated from the use of flexion-distraction to both the neck and back.