Study of Individualized, Precise and Standardized Cervical Open-door Surgery for Cervical Spinal Stenosis

Inclusion Criteria: * The age of 28-85 years old; Through systematic clinical and imaging examination, patients diagnosed with C3-7 multilevel cervical spondylitis myelopathy or cervical spinal stenosis who need to undergo posterior cervical open-door surgery. * No contraindications in preoperative routine tests and examinations. * Informed consent of patients. Exclusion Criteria: * Cervical radiculopathy * Cervical kyphosis or instability * Cervical spondylosis caused by trauma, tumor, tuberculosis and metabolic diseases * Revision surgery or combined anterior-posterior surgery is required * Serious neurological diseases affect the postoperative effect evaluation * Mental illness cannot cooperate with follow-up * Contraindications for MRI examination * Patients themselves or their families do not agree to participate in the study * Other situations that are not suitable for study participation.