Articular Disc
The fibrocartilaginous disc within the temporomandibular joint that separates the condyle from the glenoid fossa, cushioning joint movement.
Full Definition
The articular disc is a biconcave fibrocartilaginous structure situated between the mandibular condyle and the temporal bone's glenoid fossa. It divides the TMJ into superior and inferior joint compartments and facilitates smooth condylar translation and rotation. Displacement or perforation of this disc is a significant clinical and radiographic finding. Editors must distinguish this term from 'articular eminence,' which is a bony landmark rather than a soft-tissue structure. It is frequently referenced in MRI reports and surgical consent documents in dentofacial orthopedic practice.
Usage
Usage note: Do not confuse with 'articular eminence,' which is a bony prominence on the temporal bone, not the disc itself.
In Context
- "MRI findings confirmed anterior displacement of the articular disc without reduction on the affected side." — Diagnostic imaging report
- "The surgeon noted perforation of the articular disc during arthroscopic exploration." — Operative note