A subluxation is an incomplete or partial dislocation of a joint or organ.According to the World Health Organization (WHO), a subluxation is a "significant structural displacement", and is therefore always visible on static imaging studies, such as X-rays.In contrast, the chiropractic belief of "vertebral subluxation" may or may not involve a significant displacement or even pain or clear dysfunction. Joints A subluxation of a joint is where a connecting bone is partially out of the joint. [Source: Wikipedia ]