Which clinical finding most strongly suggests disc displacement as the cause of TMD?

Which clinical finding most strongly suggests disc displacement as the cause of TMD?

• A. Audible joint click during mouth opening or closing
• B. Jaw muscle tenderness only
• C. Pain with neck movement
• D. Sleep bruxism

Answer: (B)

Audible joint noises during jaw movement point most strongly to a disc problem in the temporomandibular joint. When the disc is displaced, it can slip out of and back onto the condyle as the mouth opens or closes, producing a recognizable clicking or popping sound. This phenomenon—an acoustic sign of internal derangement—directly reflects the disc’s abnormal position relative to the condyle, making it the best clue that disc displacement is at play. Jaw muscle tenderness alone suggests a muscular (myogenic) TMD rather than a joint-disc issue. Pain with neck movement could come from cervical or referred pain and isn’t specific to disc displacement. Sleep bruxism increases loading on the joint and muscles but doesn’t by itself indicate the presence of a displaced disc.

Audible joint noises during jaw movement point most strongly to a disc problem in the temporomandibular joint. When the disc is displaced, it can slip out of and back onto the condyle as the mouth opens or closes, producing a recognizable clicking or popping sound. This phenomenon—an acoustic sign of internal derangement—directly reflects the disc’s abnormal position relative to the condyle, making it the best clue that disc displacement is at play.

Jaw muscle tenderness alone suggests a muscular (myogenic) TMD rather than a joint-disc issue. Pain with neck movement could come from cervical or referred pain and isn’t specific to disc displacement. Sleep bruxism increases loading on the joint and muscles but doesn’t by itself indicate the presence of a displaced disc.