Subluxation

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In medicine, a subluxation is an incomplete or partial dislocation of a joint or organ [link]. A dislocation of any joint will usually need medical attention to help relocate the joint, however with a subluxation the patient will often report the joint relocating by itself.

In ophthalmology, subluxation is most often used in the context of describing ectopia lentis, an ocular condition characterized by a displaced or malpositioned lens within the eye[link]. Although a relatively rare disorder, subluxated lenses are frequently found in those who have had ocular trauma and those with certain systemic disorders, such as Marfan syndrome and homocystinuria. Some subluxated lenses may require removal, as in the case of those that float freely or those that have opacified to form cataracts.

In orthopedics, subluxation refers to the abnormal movement of a bone within a joint. For example, nursemaid's elbow is the subluxation of the head of the radius in the elbow.

In chiropractic a subluxation is located in the spine and is defined as a condition in which a vertebra has lost its proper juxtaposition with an adjacent vertebra (to an extent less than a luxation) in such a way as to alter nerve function.

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