The cervical laminoplasty via the conventional approach will apply median dissection of the cervical spinous ligament and seperate muscles to expose the whole lamina of cervical vertebrae.

According to the severity of patient's neck pain, on a scale of 1-10, let patients themselves choose one score.

0 means no pain and 10 means extreme pain.

Based on the impact on work and life, and objective examination of neck paraspinal muscles and trapezius for spasms and tenderness, divided into 4 grades:

• "Excellent": No abnormal sensations in the neck, no tenderness or muscle spasms;
• "Good": Mild symptoms after fatigue or cold exposure, but quick recovery, no significant impact on daily work and life, no tenderness or mild spasms in neck muscles, no need for painkillers;
• "Fair": Symptoms often appear <100 days/year, daily work and life are somewhat affected, mild tenderness or spasms in neck muscles, need for painkillers with good effect;
• "Poor": Symptoms frequent (>100 days/year), significantly affecting daily work and life, obvious tenderness or spasms in neck muscles, need for painkillers with poor effect.

Those rated as excellent and good are considered to have no axial symptoms, while those rated as fair and poor are considered to have axial symptoms, and the incidence is calculated.

According to patients' axial symptom and which treatment can alleviate it:

Severe (regular need for analgesics or local injections), Moderate (regular need for physical therapy or compression), or Mild (no need for treatment). Severe and moderate are defined as having axial symptoms, while mild is defined as having no axial symptoms.

Based on neck symptoms, ask the patient to rate their condition on a scale from 0 to 10, where 0 indicates no symptoms and 10 indicates severe symptoms

Safety Metrics Incidence of severe adverse events= (amount of severe adverse events/amount of patients)*100%

Safety Metrics Mortality= (amount of death/amount of patients)*100%