患者，男，27岁，车祸后感颈部疼痛及四肢瘫，排尿、排便功能障碍。行颈椎正侧位片示：C5~C6脱位，C5向前脱位50%左右，三维 CT重建显示C5下关突骨折。除肛门存在感觉外，C5平面以下其余肌力均为0级。此患者需要的进一步检查是

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