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首页> 外文期刊>AJNR. American journal of neuroradiology >Revisiting anterior atlantoaxial subluxation with overlooked information on MR images.
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Revisiting anterior atlantoaxial subluxation with overlooked information on MR images.

机译：回顾前寰枢椎半脱位与MR图像上被忽略的信息。

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BACKGROUND AND PURPOSE: The ADI is the imaging diagnostic clue to AAA subluxation of the cervical spine. Some MR imaging findings other than abnormal ADI relate to AAA subluxation. However, their relationship is not yet clarified. The present study elucidates the role of MR imaging by employing these previously overlooked findings. MATERIALS AND METHODS: This study enrolled 40 patients with AAA subluxation and 20 non-AAA subluxation patients as controls. All MR imaging was performed with supine neutral positioning. The morphology of the dens, bilateral facet joints, and surrounding ligaments, as well as the alignment of the anterior atlantoaxial joint, the spinolaminar line, and the intramedullary signal intensity, were assessed. This investigation statistically analyzed the difference among these groups. RESULTS: Thirty-eight percent (15 of 40) of patients with AAA subluxation showed nAAA. There was no significant difference between the groups of AAA with normal and abnormal ADI except that more peridental pannus was seen in the latter group. More dens erosion (P = .022), tilting of anterior atlantoaxial joint (P = .022), peridental effusion (P < .001), lateral facet arthropathy (P < .001), abnormal spinolaminar line (P = .001), and focal myelopathy (P = .001) were observed in nAAA patients compared with the controls. The combination of peridental effusion, lateral facet arthropathy, abnormal intramedullary signals, and abnormal spinolaminar line showed a sensitivity of 100% and a specificity of 90% in diagnosing AAA subluxation. CONCLUSIONS: MR imaging provides important biomechanical clues, other than ADI, that improve accuracy in diagnosing atlantoaxial instability.
机译：背景与目的：ADI是颈椎AAA半脱位的影像学诊断线索。除异常ADI外，一些MR影像学发现与AAA半脱位有关。但是，它们之间的关系尚未阐明。本研究通过采用这些先前被忽略的发现阐明了MR成像的作用。材料与方法：本研究招募了40例AAA半脱位患者和20例非AAA半脱位患者作为对照。所有MR成像均采用仰卧中性定位进行。评估了牙窝，双侧小关节和周围韧带的形态，以及前寰枢关节，脊柱椎细线和髓内信号强度的排列。这项调查统计分析了这些组之间的差异。结果：38％AAA半脱位患者中有38％（15/40）表现为nAAA。正常和异常ADI的AAA组之间没有显着差异，只是在后者组中观察到更多的偶然性pan。更大的牙本质糜烂（P = .022），前寰枢关节倾斜（P = .022），偶然性积液（P <.001），侧面小关节病（P <.001），棘突孔异常（P = .001）与对照组相比，nAAA患者观察到局灶性脊髓病（P = .001）。偶然性积液，侧面小关节病，异常的髓内信号和异常的椎板层线相结合，在诊断AAA半脱位时的敏感性为100％，特异性为90％。结论：MR成像提供了重要的生物力学线索，而不是ADI，可以提高诊断寰枢椎不稳定性的准确性。

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