title: On the determination of the angular orientation of a vertebra.
abstract: In this paper we consider the spatial orientation of vertebrae. We take the view that, in determining their rotation angles from X-rays, the procedure applied by Drerup yields the most reliable empirical results, viz. the three angles through which a vertebra rotates about its own symmetry axes in a specific sequence. With a view to the further use of this information to analyze deformations or the motion of a spine we recommend that the Drerup angles be converted into the well-known Eulerian angles. How this can be done is the subject of this report.
authors.affiliation: Department of Biomedical Engineering, Faculty of Medical Sciences, University of Groningen, The Netherlands.
authors.forename: B C E
authors.initials: BC
authors.lastname: Goris
authors.forename: M
authors.initials: M
authors.lastname: Kuipers
authors.forename: J
authors.initials: J
authors.lastname: De Vries
authors.forename: D J
authors.initials: DJ
authors.lastname: Wever
authors.forename: G J
authors.initials: GJ
authors.lastname: Verkerke
authors.forename: A G
authors.initials: AG
authors.lastname: Veldhuizen
mesh_terms: D000465:Algorithms; D001696:Biomechanical Phenomena; D006801:Humans; D008954:Models, Biological; D009068:Movement / Q000502:physiology; D011859:Radiography; D012399:Rotation; D013131:Spine / Q000000981:diagnostic imaging / Q000502:physiology*