Ultrasound Imaging for Temporomandibular Joint Disc Anterior Displacement

摘要

Temporomandibular joint (TMJ) disc anterior displacement is the most prevalent cause of temporomandibular disease (TMD). We describe ultrasonographic imaging of a case of TMJ disc anterior displacement with reduction. A healthy 29-year-old woman had a 13-year history of intermittent pain and a snapping sensation in both her cheeks. Her symptoms gradually deteriorated, and 3 years previously, she developed jaw locking while opening her mouth. Physical examination revealed palpable clicks over the bilateral TMJs while opening and closing the jaw. Ultrasonography (US; 10-14 MHz linear probe; Siemens, Germany) showed a hypoechoic disc that lays superior and anterior to the mandibular condyle when the jaw was closed [Figure la]; this finding was indicative of anterior subluxation of the TMJ. The disc shifted posteriorly and disappeared from the US imaging field when the jaw was opened [Figure lb]. Dynamic scanning revealed an abrupt recession of the disc during jaw opening and abrupt reduction during jaw closing [Video 1].