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目的 探讨下颌骨髁状突纵形骨折 (SFMC)的影像学改变及其机制。 方法 对 4 7例 (94侧 )疑有髁状突骨折的患者进行常规CT和三维重建检查 ,根据CT三维重建形态学并结合解剖学 ,就SFMC的好发部位及特点作了分析。 结果 检出各型髁状突骨折 70侧 ,其中纵形骨折2 2侧 (31.4 % ) ,位于髁状突中、外 1/ 3交界段的内极撕脱骨折 18侧 ,位于髁状突内 1/ 3段的内极撕裂 4侧 ,8例同时伴发下颌骨其他部位骨折。 结论 由于髁状突的解剖特点 ,当正中颌面部或颏部受撞击时 ,其髁头内极具有较高的张应力和较弱的承受力而导致SFMC。三维CT的重要意义在于可立体观察解剖结构及其空间关系
Objective To investigate the imaging changes and its mechanism of mandibular condylar longitudinal fracture (SFMC). Methods Forty-seven patients (94 sides) with suspected condylar fractures underwent routine CT and three-dimensional reconstruction. According to the three-dimensional CT reconstruction morphology and anatomy, the predilection sites and characteristics of SFMC were analyzed. Results All kinds of condylar fractures were detected in 70 sides, of which 2 longitudinal sides (31.4%) were located in the middle and the outer 1/3 of the condylar process. 1/3 segments of the internal tearing 4 sides, 8 cases of mandibular fracture accompanied by other parts. Conclusion Due to the anatomical features of the condyle, when the maxillofacial or chin is impacted, the medial condylar head has very high tensile stress and weaker bearing capacity resulting in SFMC. The significance of three-dimensional CT lies in three-dimensional observation of anatomical structure and its spatial relationship