A Prospective Study Comparing the Efficacy of Laminoplasty and Laminectomy With Fusion for Ossification of the Posterior Longitudinal Ligament With High Occupation Rate in Cervical Spine

Inclusion Criteria: * Patients diagnosed by clinical symptoms, physical examination, X-ray, CT, and MRI with a high occupation rate of ossification of the posterior longitudinal ligament in the cervical spine need and can be treated surgically after preoperative examination. * CT axial soft tissue window determine that the occupation rate of one or more spinal canal segments in C2-7 is more than 60%. * Sagittal CT show ossification of more than 3 segments of the posterior longitudinal ligament of the cervical spine. * Sign the written informed consent Exclusion Criteria: * Participating in other interventional clinical trials; * Mental disorders or cognitive disorders; * Heart and lung diseases; * Nervous system diseases; * Patients with serious liver and kidney diseases, tumors and infectious diseases; * There are any other factors that the treated doctors consider unsuitable for inclusion or completion of the study. * Patients with cervical spondylotic radiculopathy * Patients with severe osteoporosis, skeletal fluorosis and other reasons for which laminoplasty is not feasible * Patients with ossification of posterior longitudinal ligament of cervical spine with invasion rate ≥60% had cervical trauma * The patient with cervical ligamentum flavum ossification was diagnosed at the C2-7 level * Preoperative pregnancy test was performed to exclude pregnant women