Fig. 3From: Severe dysphagia after a posterior cervical spine fusion at the C1–C3 level and its improvement after correction surgery for malalignment: a case reportPlain radiographs after the first operation reveal the neutral alignment of the upper cervical spine region. The occiput-C2 angle is − 1.8° (a), the C1–C2 angle is − 25.1° (b) and the craniovertebral junction angle proposed by Takami is 81.1° (c)Back to article page