Abstract: Objective To explore the clinical effect of ultrasonic osteotome assisted anterior cervical hybrid decompression and fusion in the treatment of multilevel cervical spondylotic myelopathy.Methods From January 2019 to January 2021,patients with multilevel cervical spondylotic myelopathy treated by ultrasonic osteotome assisted anterior cervical hybrid decompression and fusion were studied retrospectively(31 cases).The perioperative and late follow-up data and imaging data of all cases were collected.Results All 31 patients successfully completed the operation.3 patients had transient swallowing foreign body sensation after operation,and 1 patient had titanium mesh sinking after 1 month.After close observation,they finally fused stably.No serious complications such as vertebral artery injury and esophageal fistula occurred.The JOA and NDI scores were(11.23±1.41),(14.77±3.10) at 1 month after operation,and the JOA and NDI scores at the last follow-up were(12.84±1.73),(12.77±3.80),respectively.JOA and NDI scores at each follow-up time point after operation were improved compared with those before operation(P<0.05).One month after operation,the cervical lordosis angle(Cobb angle),sagittal axial distance(SVA) and T1 tilt angle(T1s) were(15.44±2.39)°,(14.26±3.23)°,(28.18±4.49)°, respectively.At the last follow-up, the Cobb angle,SVA and T1s were(16.24±1.06),(12.96±2.43),(27.50±3.05),respectively.The Cobb angle,SVA and T1S were higher than those before operation(P<0.05).Conclusion Ultrasonic osteotome assisted anterior cervical hybrid decompression and fusion in the treatment of multilevel cervical spondylotic myelopathy has good short-term effect,and can effectively improve the sagittal parameters of cervical spine,which is conducive to the recovery of spinal cord and nerve function.

Key words: anterior cervical surgery, cervical spondylotic myelopathy, sagittal parameters of cervical spine