title: Radiological considerations of posterior cervical lateral mass fixation using plate and screw.
abstract: The aim 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 radiologically safe to patients. The lateral cervical X-rays and CT scans were done on 40 normal adults without cervical problem. Based on Roy-Camille and Magerl's method, the theological trajectory of screw was shown on films and the parameters were measured. The study based on Roy-Camille's method showed less than one percent chance of injury on the facet joint and the mean depth of the screw to be 10.5 +/- 1.4 mm. On the other hand, Magerl's method showed the mean depth of screw to be 11.9 +/- 1.5 mm which is slightly larger than that of Roy-Camille's method and no chance of facet injury occurred. A reduced lateral angle of screw (19.6 +/- 3.5 degrees C) performed with the concept based on Magerl's method resulted a longer depth of screw (13.5 +/- 2.1 mm). Both Roy-Camille and Magerl's methods seemed to be radiologically safe to normal persons. However, the authors recommend the reduced lateral angle (19.6 +/- 3.5 degrees C) of screw based on the Magerl's method more than an original Magerl's methods.
authors.affiliation: Department of Neurosurgery, Inha University Hospital, 7-206, 3 Ga, Shinheung-dong, Jung-gu, Incheon 400-711, Korea. nsysh@inha.ac.kr
authors.forename: Seung Hwan
authors.initials: SH
authors.lastname: Yoon
authors.forename: Hyoung Chun
authors.initials: HC
authors.lastname: Park
authors.forename: Heon Seon
authors.initials: HS
authors.lastname: Park
authors.forename: Eun Young
authors.initials: EY
authors.lastname: Kim
authors.forename: Yoon
authors.initials: Y
authors.lastname: Ha
authors.forename: Chong Kweon
authors.initials: CK
authors.lastname: Chong
authors.forename: Seung Min
authors.initials: SM
authors.lastname: Kim
authors.forename: Dae Cheol
authors.initials: DC
authors.lastname: Rim
mesh_terms: D000328:Adult; D001860:Bone Plates; D001863:Bone Screws; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging* / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D013123:Spinal Fusion; D014057:Tomography, X-Ray Computed / Q000379:methods*