Minowa K, Sakakibara N, Inoue N, Ohmori K, Kuroshima T, Totsuka Y, Kitagawa Y, Nakamura M
Department of Radiology, Hokkaido University School of Dentistry, Sapporo, Japan.
Dentomaxillofac Radiol. 2008 Sep;37(6):361-4. doi: 10.1259/dmfr/53043000.
Gas in the joint space was observed in three patients with condylar fracture who were referred for CT examinations of the mandible. CT showed that the condylar fractures were non-open fractures. The gas was only observed in the intrajoint capsule of the temporomandibular joint (TMJ). Follow-up CT, 4 days after the initial CT, showed that the gas in the joint space was absorbed in one of three cases. In the non-open condylar fractures, the gas collection in the TMJ was considered to be a vacuum phenomenon due to the intact joint capsule of the TMJ on CT.
在三名因下颌骨髁突骨折而接受下颌骨CT检查的患者中观察到关节间隙内有气体。CT显示髁突骨折为非开放性骨折。气体仅在颞下颌关节（TMJ）的关节囊内被观察到。初始CT检查4天后的随访CT显示，三名患者中有一名患者关节间隙内的气体已被吸收。在非开放性髁突骨折中，TMJ内的气体积聚被认为是由于CT上TMJ关节囊完整而出现的真空现象。
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