Cervical spondylotic myelopathy (CSM) is the most frequent cause of myelopathy in those over the age of 50. They claim that surgical treatment of myelopathy, especially of the mild and moderate forms, has not shown better results than conservative treatment in the long term, and criteria for the indication and the timing of the operation have not been established. In order to get some more reliable data, a long-term follow up observational study will be started to confirm the effects of long term for conservative treatment.