Fig. 1From: Analysis of risk factors for axial symptoms after posterior cervical open-door laminoplastyThe cervical spine was taken in a neutral position, and the cervical curvature was represented by the angle between the tangent line of C2 and the lower edge of C7 vertebral body. The loss of cervical curvature = postoperative cervical curvature—preoperative cervical curvatureBack to article page