What is a common sign of anterior disc displacement in the TMJ related to mandibular movement?

• A. Asymmetrical jaw alignment
• B. Popping or clicking noises upon movement
• C. Severe pain with maximal opening
• D. Unilateral facial swelling

Answer: (B)

Popping or clicking noises upon movement are indeed a common sign of anterior disc displacement in the temporomandibular joint (TMJ). This phenomenon occurs due to the abnormal positioning of the articular disc relative to the condyle within the joint during both opening and closing motions of the jaw. When the condyle moves, it can catch on the displaced disc, leading to an audible click or pop as the disc may suddenly relocate or slip back into the proper position during movement.

This symptom is particularly prevalent in individuals with anterior disc displacement because the disc may not be in the correct orientation, which alters the typical biomechanics of jaw movement. Other signs and symptoms such as pain or restricted movement may accompany this condition, but the characteristic clicking or popping sound is a key identifiable feature of the dysfunction associated with anterior disc displacement. Understanding this sign is crucial for clinicians in diagnosing TMJ disorders and determining appropriate management strategies.