subluxation

1. incomplete dislocation of a joint. 2. term applied loosely to the temporomandibular joint, indicating relaxation of the capsular ligaments and improper relationship of the joint components, resulting in cracking and popping of the joint during movement.

Partial dislocation of a joint; movement of a joint beyond its maximum passive range so that the alignment between the joint surfaces is distorted. Unlike a complete dislocation, partial contact is maintained between the articulating bones. It is often a transient condition with the joint going back to its normal position without any special treatment, but sometimes a deformity persists. A subluxation of the collar bone at the acromoclavicular joint, as a result of a badly timed tackle in a contact sport, for example, commonly leaves a deformity if not treated properly. Subluxations often recur because they are usually linked with an inherent weakness of the surrounding structures or an anatomical abnormality.

A partial dislocation. In the terminology of chiropractic, an abnormal positional relationship between contiguous vertebrae resulting in abnormal biochemical and neurological function.

• angle of s. — in the Ortolani maneuver, the point at which the hip luxates. See also angle of reduction.

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