Magnetic resonance imaging assessment of acute soft tissue injuries to the temporomandibular joint.

PURPOSE

This study involves the use of magnetic resonance imaging (MRI) to document acute soft tissue injuries involving the temporomandibular joint (TMJ) after condylar fractures.

MATERIALS AND METHODS

Patients with condylar fractures whose clinical and radiographic examinations, as well as the mechanism of their injury, suggested specific damage to the temporomandibular soft tissues underwent MRI scanning. Thirteen patients who met selected criteria were included in this study.

RESULTS

Ten patients demonstrated disc avulsion, usually in the anterior or medial direction. Two patients had disruption of the lateral capsule, and one patient showed no MRI evidence of acute injury. Joint effusions were frequently demonstrated.

CONCLUSIONS

MRI of condylar fractures in those patients with displacement, or in whom the mechanism of injury would predispose them to posttraumatic internal derangement, may assist the clinician in determining whether primary or delayed treatment is indicated. Furthermore, MRI may be a useful resource for enhancing the level of understanding regarding soft tissue changes that occur in the TMJ after acute condylar trauma.