Abstract:Objecitve To evaluate the effect of open-door laminoplasty with ultrasonic scalpel in the treatment of multisegmental cervical spondylosis (MCSM) and cervical instability. Methods A total of 32 patients with MCSM and partial cervical instability were treated with single open door laminoplasty from June 2017 to May 2018.The operation time was recorded.The symptoms, signs and neurological function were recovered and recorded.JOA score was used to evaluate spinal cord function before, after and during follow-up.X-ray and CT Reexamination were used to evaluate cervical curvature, stability, internal fixation position and spinal canal enlargement.The recovery of cervical curvature in kyphosis was evaluated by the angle between C₂ to C₇(CSA). Results All patients completed the operation as scheduled. The operation time was 90-210 (144.00±49.50) min.The follow-up time was 8-15 (14.80±2.12) months.The postoperative X-ray and CT examination showed that the curvature of cervical spine recovered well in patients with kyphosis.All patients had no broken nail, broken rod or cervical instability.CT showed that the screw position was good and the effect of laminoplasty was satisfactory.JOA score was 6.47±1.41 before operation, 7.50±1.51 one week after operation, and 10.75±1.54 at the last follow-up.JOA score was higher at the first week and the last follow-up than before operation, and it was higher at the last follow-up than one week after operation (P<0.01).The evaluation of cervical curvature in 10 patients with kyphosis was -10.70°±1.54° before the operation, 17.20°±1.07° after the operation, and 17.60°±1.25° at the last follow-up.CSA was superior to that before the operation in 1 week and at the last follow-up (P<0.01).There was no significant difference between the first week and the last follow-up (P>0.05). Conclusion Ultrasound osteotomy is a safe and effective method in the treatment of MCSM.It is beneficial to the recovery of cervical curvature and the maintenance of good stability of cervical spine.