INTRODUCTION: Fractures of the zygomatic arch extended to the glenoid fossa are rare and seldom reported. OBSERVATION: A 26-year-old man with a slightly dislocated fracture of the zygoma associated with trismus, and localized pain in the right Temporo-Mandibular Joint (TMJ) on palpation, but without any condylar fracture. The craniofacial CT scan revealed a fracture of the zygoma extended to the glenoid fossa. The treatment was an intraoral reduction of the zygoma and screw fixation of the glenoid fossa lateral region. DISCUSSION: The risk of delayed healing by mobilization of the bone fragments was opposed to the risk of TMJ ankylosis due to a prolonged immobilization of the joint. Osteosynthesis of the fracture was finally chosen.
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