Fig. 1

Case 1 radiographs. a Lateral plain radiograph of the cervical spine after laminoplasty for cervical spondylotic myelopathy showing normal sagittal alignment. The patient complained of head drop and severe low back and lower extremity pain 2 months after laminoplasty. b Lateral whole-spine radiograph showing marked cervical spine kyphosis and lumbar spine hyperlordosis. c After cervical corrective fusion (C2–C4), cervical kyphosis and lumbar hyperlordosis, as well as lumbar spine symptoms, were relieved. C cervical vertebra