Abstract
Since 1983 operative treatment was performed in 57 patients (47 males, 10 females) of cervical myelopathy by means of cervical spinal canal enlargement, which consist of 42 cervical spondylotic myelopathy, 12 cervical ossification of posterior longitudinal ligament and 3 cervical spinal cord injury. Their ages at the time of operation ranged from 25 to 79 years old and the average was 57 years old. The clinical results were evaluated using J. O. A. score of cervical myelopathy and recovery rates of Hirabayashi's method. The preoperative average was 7.9 points, and it was improved up to 13.6 points postoperatively. The average recovery rate was 64.0%. After operation cervical instability was seen in 3 cases. In two of them cervical physiological lordosis disappeared preoperatively. The enlargement breadth of cervical spinal canal in the sagital diameter was not correlated with the clinical results. The clinical results were much influenced by the factors of age and duration of history. Cervical spinal canal enlargement (by Hirabayashi's method) is a very valuable and safe procedure for cervical myelopathy.
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