title: Vertebral axial rotation measurement method.
abstract: This study presents a new method for measuring axial rotation of vertebra. Anatomical landmarks of the vertebral body were first recognized in X-ray film. By employing appropriate geometrical relationships, vertebral body shape parameters and a computer iteration method, the rotation angle of vertebra on the transverse plane can rapidly be obtained. A cadaver lumbar spine axial rotation-fixation device was designed to confirm the accuracy of the proposed methodology. Rotation angles on CT images were adopted as the golden standard and compared with analytical results based on X-ray films. Analytical results demonstrated that the proposed method obtained more accurate and reliable results than previous methods.
authors.affiliation: Department of Bio-industrial Mechatroics Engineering, National Chung Hsing University, Taiwan, ROC.
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Chi
authors.forename: Ching-Wei
authors.initials: CW
authors.lastname: Cheng
authors.forename: Wei-Cheng
authors.initials: WC
authors.lastname: Yeh
authors.forename: Shih-Chang
authors.initials: SC
authors.lastname: Chuang
authors.forename: Ti-Sheng
authors.initials: TS
authors.lastname: Chang
authors.forename: Jian-Horng
authors.initials: JH
authors.lastname: Chen
mesh_terms: D000465:Algorithms; D000886:Anthropometry; D001175:Arthrography; D001415:Back; D001696:Biomechanical Phenomena; D002684:Chiropractic; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging; D008953:Models, Anatomic; D009038:Motion; D009068:Movement; D016059:Range of Motion, Articular; D015203:Reproducibility of Results; D012399:Rotation; D012600:Scoliosis / Q000000981:diagnostic imaging*; D013131:Spine / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014965:X-Rays