“Subluxation/joint dysfunction” is a term used to describe a problem with a spinal joint. The World Health Organization defines a “subluxation” as a functional problem related to a joint and the structures associated with the joint such as the muscles, tendons and nerves. Subluxation/joint dysfunction can present itself in various ways such as pain, inflammation and restricted movement of the joint. Some types of dysfunction, such as a sprain, will not appear on an x-ray. Chiropractors are trained to identify dysfunction that does not appear on imaging through the use of manual examination and non-imaging diagnostic tests.