Does developmental canal stenosis influence surgical results of bilateral open-door laminoplasty for cervical spondylotic myelopathy?

Clinical article

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The purpose of this study was to investigate the prevalence of developmental canal stenosis in patients with cervical spondylotic myelopathy (CSM), and the correlation between surgical results and degree of developmental canal stenosis.


A total of 112 patients who eventually had surgical treatment for CSM were evaluated. Male patients whose sagittal spinal diameter was < 14 mm and females whose sagittal diameter was < 13 mm even at one level were classified as having developmental canal stenosis. Two groups of patients were used in this study; the “positive” group (57 cases) included patients with developmental canal stenosis preoperatively, whereas the “negative” group (55 cases) excluded such patients. Lateral functional radiographs obtained in patients in the 2 groups were compared for range of motion and clinical results.


Developmental canal stenosis was found in 50.9% of all cases. Based on clinical results, there was no significant difference between the 2 groups.


Patients with CSM showed a high incidence of preoperative developmental canal stenosis. However, there were no significant differences in clinical results between patients with and without this disorder. These results indicate that developmental canal stenosis is not a factor that influences surgical results.

Abbreviations used in this paper: AP = anteroposterior; CSM =cervical spondylotic myelopathy; JOA = Japanese Orthopaedic Association; ROM = range of motion.

Article Information

Address correspondence to: Hideki Shigematsu, M.D., Department of Orthopedic Surgery, Nara Medical University, Shijyou 840, Kashihara, Japan. email:

© AANS, except where prohibited by US copyright law.



  • View in gallery

    Schematic showing the method used to measure the AP spinal canal diameter (arrows).

  • View in gallery

    Schematic showing measurement of the ROM, which is defined as the angle between C2 and C7 on lateral functional radiographs. The ROM was calculated as a + b.



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