脑外伤均合并颈外伤，即环枢椎半脱位等。
It is suggested that brain trauma may always be accompanied with cervical trauma, that is, atlantoaxial subluxation, etc.
CT对无移位的齿状突骨折和轻度环枢椎脱位不敏感。
Odontoid fracture could not be shown with CT if without atlantoaxial dislocation.
后方环枢间距又称脊髓可用空间常常被用来作为诊断的标准。
A criteria often used to make the diagnosis is the Posterior AtlantoDens Interval (PADI) also known as the Space Available for Cord (SAC).
方法分析20例环枢关节外伤病例的MSCT资料，观察各种重建方法对病变的显示情况。
Methods MSCT data of 20 cases of traumatic atlantoaxial joints were analyzed, the ability of different reconstruction methods in showing the traumatic aspects were evaluated.
结果MSCT轴位及MPR、3D重建相结合，可清楚显示环枢关节各部位隐蔽性的外伤性改变。
Results Axial MSCT and in combination with reconstruction methods such as MPR and Direct 3D could distinctly depict atlantoaxial joint in full view.
后方环枢间距的距离小于13mm常常伴有神经学症状，俯曲位c1 - C2平移超过5 mm也意味着预后不良。
PADI of less than 13mm is associated with neurologic decline. C1-C2 translation of more than 5mm on flexion-extension radiographs also has a poor prognosis.
上支架内端枢接在伞支杆环套上，且各该上支架外覆设一伞布；
Flection is arranged on a plurality of lower supports which are pivoted with the folding control sleeve of the umbrella.
上支架内端枢接在伞支杆环套上，且各该上支架外覆设一伞布；
Flection is arranged on a plurality of lower supports which are pivoted with the folding control sleeve of the umbrella.
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