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KMID : 0857020020170010077
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Kosin Medical Journal
2002 Volume.17 No. 1 p.77 ~ p.84
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Radiologic consideration the posterior cervical plate-screw fusion
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Kim Seong-Min
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Abstract
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Background : The purpose of this study is to determine whether the Posterior Cervical Fusion methods with the plate-screw system applied to the lateral mass of cervical spine are clinically safe to Korean patients.
Method : The lateral cervical X-ray and Computed Tomography(CT) was done on 10 normal adults without cervical problem. Based on the Roy-Camille and Magerl’s method, the theological trajectory of screw was shown on films and the parameters were measured.
Results : The study based on the Roy-Camille’s method showed one percent chance of injury on the facet joint and the safe margin of the screw to be 10.2±1.6mm. On the other hand, Magerl’s method showed the safe margin of screw to be 12.1±1.6mm which is slightly larger than that of Roy-Camille’s method. No chance of facet injury occurred. A reduced lateral angle of screw(19.6±3.5°) performed with the concept based on Magerl’s method resulted a longer depth of screw(13.3±2.1mm), and is to be clinically safer. This study also showed the average cephalized sagittal angle of screw to be 43.9±4.5°, and being increased on lower cervical level. The width and length of lateral mass was 10.1±0.8mm, 12.0±2.9mm. Both the Roy-Camille and Magerl’ methods seemed to be clinically safe to Koreans. The measured interval of screw was 16.8±2.0mm, however, there was a large deviation depending on individuals.
Conclusion : The depth of screw being smaller compared to other studies, leads to the conclusion that attention should be paid on the depth and interval of screw when applying the Posterior Cervical Fusion methods with the plate-screw system applied to the lateral mass of cervical spine to practice.
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KEYWORD
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Posterior Cervical Fusion, Plate-screw system, Lateral mass
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