1990 Volume 39 Issue 1 Pages 339-343
Between 1984 and 1989, 14 patients with a diagnosis of cervical OPLL were treated by Hirabayashi's laminoplasty method in our institution. There were 12 men and 2 women, between the ages of 42 and 74 years (mean, 58.7 years). These patients were followed for 4 to 68 months. The duration of the interval between the initial occurrence of symptoms and operation ranged from one to 120 months (mean, 28.1 months).
We studied as to clinical results and the morphologic changes. Results were as follows.
1) Clinical results showed 59.6% according to the improvement rate of Hirabayashi's method.
2) Postoperative cervical antero-posterior movement decreased to below a half of preoperative movement.
3) Cervical alignment showed a tendency to be straight, but there was no instability nor deformity.
4) There was a possible correlation between lost angular anteroposterior movement after operation and clinical results.
