Fig. 7

A 61-year-old female patient underwent C3-7 single-door posterior laminoplasty in our hospital. At 6 months after operation, the patient still had axial symptoms such as neck and shoulder pain and numbness. a, d The preoperative cervical curvature and postoperative cervical curvature were 5.8°and 3.0°, respectively, and the loss of cervical range of motion was 2.8°. b, c, e, f The preoperative cervical range of motion and postoperative cervical range of motion were 28.2°and 19.6°, respectively, and the loss of cervical range of motion was 8.6°. g, h The preoperative and postoperative lamina angles were 36.0°and 51.2°, respectively, and the opening angle was≈15.2°(only one segment was listed here, and the final opening angle was the average opening angle of all surgical stages, so ≈ was used here). i preoperative encroachment rate of anterior spinal canal = 38.0%