An abnormal relationship between the articular disc and the mandibular condyle. The general consensus is that the posterior band of the disc generally lies in front of the condyle and that the condyle functions on the posterior attachment. Imaging studies have demonstrated that disc displacements are relatively common. Three stages of disc displacement have been identified:
Stage I: Disc displacement with reduction (hearing and palpating joint noises during opening and closing, protrusive opening and closings stops the reciprocal click).
Stage II: Disc displacement without reduction (history of clicking and popping with or without intermittent locking, complaint of limited mouth opening).
Stage III: Chronic disc displacement without reduction (hearing multiple noises during opening and closing (crepitus), with normal or near normal mandibular dynamics).
The video below is helpful.
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