title: [Positioning study of cervical vertebra pedicle axial line projective point by CT image reconstruction].
abstract: OBJECTIVE
  To improve the safety and accuracy of trans-pedicle internal fixation for cervical vertebra by the parameter data measuring by CT reconstruction.
  
  
  METHODS
  Thirty volunteers were enrolled and be subjected to high-speed spiral CT for getting the data of C3-C7. The data included pedicle point-midline distance, pedicle sponge width, pedicle angle. The cervical vertebra pedicle morphology were reconstructed.
  
  
  RESULTS
  Reconstructed CT image data displayed that pedicle sponge width become larger and larger from C3 to C7; the pedicle depth didn't change significantly even from C3 to C7; pedicle angle become small from C3 to C7 and the range is from 33.76 degrees to 47.20 degrees; pedicle point-midline distance were almost similar even from C3 to C7. There were not statistical differences between the right side and the left side, but there were statistical differences between man and woman.
  
  
  CONCLUSIONS
  Reconstructed CT image can provide useful data for clinical cervical vertebra trans-pedicle internal fixation.
authors.affiliation: Department of Trauma and Orthopaedics, People's Hospital, Peking University, Beijing 100044, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Xue
authors.forename: Pei-xun
authors.initials: PX
authors.lastname: Zhang
authors.forename: Dian-ying
authors.initials: DY
authors.lastname: Zhang
authors.forename: Zhong-guo
authors.initials: ZG
authors.lastname: Fu
authors.forename: Bao-guo
authors.initials: BG
authors.lastname: Jiang
mesh_terms: D000328:Adult; D001863:Bone Screws; D002574:Cervical Vertebrae / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation / Q000379:methods; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D036542:Tomography, Spiral Computed / Q000379:methods*