Purpose: The purpose of this study was to examine disc position and configuration, as well as clinical findings, during the natural course of nonreducing disc displacement of the temporomandibular joint (TMJ). Patients and Methods: The subjects were 21 patients (24 affected joints) for whom a diagnosis of anterior disc displacement without reduction in the TMJ had been made on arthrography, but who had received no treatment for more than 12 months. The disc position and configuration were examined at a mean follow- up of 27.1 months using magnetic resonance imaging. Clinical signs and symptoms were also examined. As a control, 30 joints in 15 persons who had no current or previous TMJ symptoms were studied. Results: The patients' clinical signs and symptoms tended to be alleviated during the follow-up period. In all patients, the disc was displaced anteriorly on mouth closure, and it did not reduce into normal position during mouth opening at the follow-up, whereas normal disc position was found in all of the controls. In the patients, the disc deviated from the normal biconcave configuration found in all of the controls, frequently showing enlargement of the posterior band, even thickness, folding, and convex configurations in the follow-up magnetic resonance imaging. Conclusion: Disc displacement does not resolve, and continued disc deformity is common in the natural course of nonreducing disc displacement of the TMJ, although the clinical signs and symptoms tend to become alleviated.
ASJC Scopus subject areas
- Oral Surgery