The difference between anterior cervical and posterior cervical surgery for cervical spondylosis is determined mainly by the damaged disc segments. If the damaged segments are less than 3, the anterior approach is usually used. The biggest feature of the anterior approach is fast recovery, good results and subjective postoperative comfort. If the segments are larger than 3-4, posterior surgery is usually chosen because if the anterior surgery is done again, the spinal cord compression can also be lifted, but the anterior surgery is too long, and the neck will be stiff if all the segments are nailed after surgery, so after the posterior surgery, the spinal cord surface canal is opened from the back, called single-opening surgery or pedicle screw fixation to achieve indirect decompression, so that the cervical spine can be preserved when doing single-opening surgery. This is the difference between anterior and posterior surgery.