The purpose of manipulation is to restore joint mobility by manually applying a controlled force into joints that have become hypo-mobile or restricted in their movement as a result of tissue injury. Tissue injury can be caused by a single traumatic event, such as improper lifting of a heavy object or through repetitive stresses, such as sitting in an awkward position with poor spinal posture for an extended period of time. In either case, injured tissues undergo physical and chemical changes that can cause inflammation, pain and diminished function to the sufferer. Manipulation, or adjustment of the affected joint and tissues restores mobility thereby alleviating pain, muscle tightness and allows tissues to heal.