title: Dynamic motion analysis of dart throwers motion visualized through computerized tomography and calculation of the axis of rotation.
abstract: We used a dynamic three-dimensional (3D) mapping method to model the wrist in dynamic unrestricted dart throwers motion in three men and four women. With the aid of precision landmark identification, a 3D coordinate system was applied to the distal radius and the movement of the carpus was described. Subsequently, with dynamic 3D reconstructions and freedom to position the camera viewpoint anywhere in space, we observed the motion pathways of all carpal bones in dart throwers motion and calculated its axis of rotation. This was calculated to lie in 27° of anteversion from the coronal plane and 44° of varus angulation relative to the transverse plane. This technique is a safe and a feasible carpal imaging method to gain key information for decision making in future hand surgical and rehabilitative practices.
authors.affiliation: 1Department of Surgery, Monash University, Victoria Epworth Healthcare, Richmond, Victoria, Australia.
authors.forename: Y
authors.initials: Y
authors.lastname: Edirisinghe
authors.forename: J M
authors.initials: JM
authors.lastname: Troupis
authors.forename: M
authors.initials: M
authors.lastname: Patel
authors.forename: J
authors.initials: J
authors.lastname: Smith
authors.forename: M
authors.initials: M
authors.lastname: Crossett
mesh_terms: D001696:Biomechanical Phenomena; D002348:Carpal Bones / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D050824:Carpal Joints / Q000033:anatomy & histology* / Q000000981:diagnostic imaging* / Q000502:physiology; D005260:Female; D056973:Four-Dimensional Computed Tomography / Q000379:methods*; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology; D012399:Rotation; D014955:Wrist Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000502:physiology
keywords: 4D CT; Dart throwers motion; axis of rotation; carpal kinematics; midcarpal joint; motion mapping; musculoskeletal imaging