 The aim of DN is to treat myofascial or neuromusculoskeletal pain and improve movement impairments. The mechanism which with DN purportedly works has been the subject of debate for many years. It is generally accepted that the needle has to be inserted into a trigger point, where it will produce a local muscle twitch response and consequently inactivate the trigger point Dunning. Some propose that the quick muscle contraction induces normalization of tissue pH and reduction of biochemical and neurotransmitters that stimulate pain receptors - a local response Shah. Others suggest that DN interrupts the trigger points ongoing nociceptive input into the dorsal horn - a segmental response Fernandez-de-las-Penas. Others again submit that, because some trigger points affect limbic and dorsal hippocampus activity, DN might have a central response Niddam. 