TY - CHAP M1 - Book, Section TI - Temporal Mandibular Joint Dislocation A1 - Jauch, Edward C. A1 - Valdez, J. Amadeo A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason PY - 2021 T2 - The Atlas of Emergency Medicine, 5e AB - Temporomandibular joint (TMJ) dislocation generally occurs in predisposed individuals after a vigorous yawn or seizure, or less commonly from direct trauma to the chin while the mouth is open. Dislocation occurs when the mandibular condyles displace forward and become locked anterior to the articular eminence. Masseter muscle spasm contributes to prevention of spontaneous relocation. Weakness of the temporomandibular ligament, an overstretched joint capsule, and a shallow articular eminence are predisposing factors. Patients usually present with an inability to close an open mouth. Other associated symptoms include pain, discomfort, facial swelling near the TMJ, and difficulty speaking and swallowing. Anterior dislocations are most common; however, posterior dislocation may occur with significant trauma, often in association with basilar skull fractures. Unilateral dislocation results in deviation of the mandible to the unaffected side. TMJ hemarthrosis and dystonic reactions may mimic TMJ dislocations. Mandibular fractures should be considered if there is a history of facial trauma. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/11/02 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181040577 ER -