What does clicking of the TMJ typically indicate?

• A. Normal joint function
• B. Internal derangement of the TMJ
• C. Hypomobility of the TMJ
• D. Joint hypermobility

Answer: (B)

The clicking of the temporomandibular joint (TMJ) is typically indicative of internal derangement of the joint. This phenomenon generally arises from alterations in the normal anatomy or function of the joint components, such as the disc and the condyle.

In cases of internal derangement, the articular disc, which cushions the joint and provides smooth movement during jaw motions, can be displaced or can move inappropriately during the opening or closing of the mouth. This improper movement leads to a clicking sound as the structures within the joint interrelate in an abnormal manner.

Understanding this mechanism is crucial; the sound arises when the displaced disc reduces (returns to its proper position) or displaces again during movement. This can often be accompanied by symptoms such as pain, restricted movement, or a sensation of locking in the jaw.

Other choices, while they represent various aspects of TMJ conditions, do not align with the characteristic auditory symptom of clicking. For example, normal joint function typically does not produce any sounds during movement, and hypomobility or hypermobility describes other functional states of the joint without specifically correlating with the clicking sound associated with internal derangement.