The factors affecting the outcome of cervical spondylosis surgery are complex. However, for patients with neurogenic cervical spondylosis who are ineffective with conservative treatment or who have recurrent symptoms despite effective treatment, the majority of patients can obtain satisfactory results after surgery. Patients with clearly diagnosed vertebral artery type and sympathetic type cervical spondylosis who are ineffective with non-surgical treatment or who have recurrent symptoms often have significant results after surgical treatment. As for patients with spinal cord type cervical spondylosis, early surgery is advocated except for a few patients with mild symptoms who can be treated with non-surgical treatment to observe the efficacy. The excellent rate is 50% to 90%, which may be related to the inconsistent criteria for judging the efficacy. There are mainly the following reasons for poor efficacy after surgery: 1. Long duration of disease: The longer the duration of disease, the worse the efficacy. If the clinical symptoms and signs of cervical spondylosis patients are heavy, the patients are more painful, and the effect of non-surgical treatment is not significant, surgical treatment should be considered. Research shows that patients with cervical spondylosis, whether the spinal cord or nerve roots are compressed for a long time, neurodegeneration can occur, and if not decompressed in time, it can develop into irreversible changes, at which time even if they receive surgical treatment, the surgical effect is greatly reduced. 2, age: because of the different ages of cervical spondylosis patients, their surgical efficacy also differs, the older the age, the worse the efficacy. Spinal cord type cervical spondylosis is closely related to the compression of the anterior spinal artery, so the effect of doing decompression surgery is more significant. However, older patients are prone to post-decompression vasoparalytic edema, which can lead to less blood supply to the spinal cord and thus further impairment of the function of the spinal cord, and timely administration of dehydrating and decongesting drugs can prevent aggravation of the condition. The elderly are bound to have vascular sclerosis and other factors, and their compensatory capacity is not as good as that of young people, so their long-term outcome is also poor. 3, cervical spinal stenosis: those with developmental cervical spinal stenosis have early symptoms, and even if decompression surgery is done, the efficacy is mostly poor, and posterior spinal canal enlargement and shaping can improve the treatment effect. 4. ossification of the posterior longitudinal ligament of the cervical spine: patients with obvious ossification of the posterior longitudinal ligament of the cervical spine are generally not easy to be missed, and doctors will make predictions and explain to patients before surgery, so that patients have a general understanding of the effect of surgery. However, there are some cervical spine patients with cervical spondylosis who exhibit ambiguous bone at the posterior edge of the vertebral body on lateral cervical spine X-rays, which are not easily identified as ossified tissue and should be further examined by CT in order to confirm the diagnosis. If the patient has extensive ossification of the posterior longitudinal ligament of the cervical spine, the choice of treatment method is quite important, and if the choice is improper, it will seriously affect the effect of surgical treatment. 5. Bone implant not fused: bone implant is an important part of cervical spine surgery, but sometimes the implanted bone is not fused with the bone of the cervical spine, resulting in instability of the cervical spine, formation of bone redundancy at the posterior edge of the cervical vertebral body, reduction of the anterior and posterior diameter of the cervical spinal canal, resulting in narrowing of the cervical spinal canal, thus affecting the efficacy of the surgery. Bone graft type: autologous bone graft is good, only 50% of homogeneous allogeneic bone graft is fused, and the distance between the vertebrae becomes smaller after bone graft absorption, which will cause the spinal canal stenosis in the department to increase and affect the efficacy. 6, improper choice of surgical method: such as anterior cervical surgery can not solve the pressure of the yellow ligament on the spinal cord from behind, so the treatment effect is affected. 7, wrong diagnosis: the symptoms and signs of patients with intravertebral or intracranial tumors, early spinal tuberculosis, lesions of the spinal cord itself and deformities of the occipital foramen area can be confused with the clinical manifestations of spinal cervical spondylosis, and if patients with non-cervical spondylosis are operated as cervical spondylosis, the effect is definitely not good. 8, the decompression of the spinal cord by surgery is not complete: if the cervical vertebrae are more than 3 mm, which obviously affects the anterior and posterior diameters of the cervical spinal canal, if no decompression is done or the decompression is not complete, the surgical effect is poor. Since the pathogenesis of cervical spondylosis and the process of spinal cord injury and rehabilitation have not been studied enough at present, human understanding of this is still relatively superficial. Therefore, the exact reasons for the unsatisfactory surgical results in some patients with cervical spondylosis are not well understood.