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We analyzed the post-operative radiographic findings in 112 cases with cervical spondylotic myelopathy who were operated by anterior or posterior approach and the following results were obtained.1) Solid fusion of the intervertebral space occurred in most patients within 4 months and pseudarthrosis developed in 12% of 83 cases.2) The changes of the fused intervertebral height were classified into five groups, B group (the height increased at the time of operation, but decreased gradually after-ward) was founded more frequently than other groups.3) The posterior spurs which had not been removed were resorbed gradually within 1 year to 3 years after the operation.4) At the adjacent intervertebral discs, disc narrowing (22%), posterior spur formation (28%), instability (22%) developed. However, these changes at the adjacent discs or pseudarthrosis at the fused levels did less frequently correlate with the clinical results.5) 5 cases (28%) of enlargement of the cervical canal without laminectomy, and 4 cases (36%) of laminectomy showed abnormal alignment at the time of study, but the degree was generally slight.