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CT measurement of cervical sequence 1,2 and its diagnostic value of atlantoaxial dislocation

As a routine examination in order to avoid finding out the reasons patients have symptoms. CT scan should be a continuous thin layer technology, to improve the spatial resolution and reduce partial volume effects. CT reconstruction and 3D multi-directional image sequences clearly show the spinal canal, broke into the spinal fracture fragments and to determine fracture orientation film. Odontoid fracture of the base of many of its transverse fracture, fracture can occur after the 425 * different levels of displacement, flexion type injury can be accompanied by forward dislocation of the atlas, back hyperextension type of injury is dislocation]. Diagnosis is based on: ① the first history of neck trauma and the corresponding I clinical symptoms. ② upper extremity sensory examination showed sensitivity,[link widoczny dla zalogowanych], feeling loss and so on. ③ CT reconstruction and 3D multi-directional post-processing: atlanto-odontoid joint space> 2.0mm, spinal canal before and after the connection with the wrong edge; odontoid lateral mass of atlas relations and bilateral asymmetry, and lateral atlantoaxial joint position changer. Differential Diagnosis: ① normal variation. When the odontoid lateral mass asymmetry and bilateral,[link widoczny dla zalogowanych], without changing the lateral atlantoaxial joints who can not make a diagnosis of dislocation or subluxation. ② atlantoaxial joint degeneration. Similar clinical manifestations and the disease, but imaging the anterior arch of the atlas showed the margin of the articular surface of bone hyperplasia, joint space narrowing, transverse ligament calcification,[link widoczny dla zalogowanych], intra-articular vacuum phenomenon, and cystic degeneration of articular cartilage and joints under the next free bone block, etc.],[link widoczny dla zalogowanych], but no joint correspondence between many of the changes. [
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