A patient can open normally without pain, but their TMJ is 'clicking/popping'. What is causing this?

A patient can open normally without pain, but their TMJ is 'clicking/popping'. What is causing this?

• A. Anterior disc with reduction
• B. Anterior disc without reduction
• C. Muscle problems
• D. Dislocation

Answer: (A)

The scenario points to anterior disc displacement with reduction. When the jaw is closed, the articular disc sits anterior to the condyle. As you open, the condyle slides forward and the displaced disc "reduces" back onto the condyle, producing an audible click or pop. Because the disc realigns during movement, opening can be normal or near-normal and may be painless, which fits a clicking jaw without a locked or painfully limited bite. If the disc stayed displaced during opening (without reduction), you'd expect limited opening or a jaw that locks rather than just a click. Muscle problems cause pain or tenderness with movement rather than an audible joint sound, and dislocation usually prevents proper closing or causes a dramatic misalignment, not simply a click.

The scenario points to anterior disc displacement with reduction. When the jaw is closed, the articular disc sits anterior to the condyle. As you open, the condyle slides forward and the displaced disc "reduces" back onto the condyle, producing an audible click or pop. Because the disc realigns during movement, opening can be normal or near-normal and may be painless, which fits a clicking jaw without a locked or painfully limited bite. If the disc stayed displaced during opening (without reduction), you'd expect limited opening or a jaw that locks rather than just a click. Muscle problems cause pain or tenderness with movement rather than an audible joint sound, and dislocation usually prevents proper closing or causes a dramatic misalignment, not simply a click.