Surgical result of canal-expansive laminaplasty in the aged.

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The operation was performed on 52 patients, 51 patients we could follow-up for more than one year, 30 with ossification of the posterior longitudinal ligament (OPLL) and 21 with cervical spondylosis or spinal stenosis (CSM), which consisted of 8 cases and 11 cases of the aged respectively. The series was composed of 33 men and 18 women. Their ages ranged from 45 to 78 years, with an average age of 60.8 years, that of the aged, 69.9 years. The length of follow-up ranged from 1 to 10 years (average: 4.5 years). The clinical results were evaluated using J. O. A. score of cervical myelopathy and recovery rates of Hirabayashi's method.The recovery rates of OPLL (64.2%) were superior to CSM (52.6%), each was well improved from preoperative status.Their ages were not correlated with the recovery rates.The recovery rates of mal-alignment groups, such as kyphotic and Sigmoid type, tended to decrease in the follow-up study.Operative indication should be determined carefully before deciding on mal-alignment groups.In spite of the aged, surgical treatment should be considered, if general condition is permitted.