title: Effect of anatomical landmark perturbation on mean helical axis parameters of in vivo upper costovertebral joints.
abstract: The literature concerning quantification of costovertebral joint (CVJ) motion under in vivo conditions is scarce. Most papers concerning this topic are related to ex vivo loading conditions. In vivo protocols are available from the literature to determine rib and vertebra kinematics but new developments are needed to improve data processing concerning CVJ behaviour obtained from discrete breathing positions showing limiting ranges-of-motion and sensitive to noise. Data from previous work were used to implement a method analyzing mean helical axis (MHA) and pivot point parameters of the CVJ complexes. Several levels of noises were estimated within Monte-Carlo simulations to optimize MHA results. MHA parameters were then used to transform and define a CVJ-specific local coordinate system. This study proposes an improvement for CVJ kinematics processing and description from in vivo data obtained from computed tomography. This methodology emphasizes the possibility to work with variability of MHA parameters using Monte-Carlo procedures on anatomical landmark coordinates and to define a local coordinate system from this particular joint behaviour. Results from the CVJ joint model are closer to a hinge joint (secondary motions inferior to 3°) when anatomical frames are expressed from MHA orientation. MHA orientation and position data obtained from the proposed method are relevant according to angular dispersion obtained (from 7.5° to 13.9°) and therefore relevant to define behaviour of CVJ.
authors.affiliation: Laboratory of Anatomy, Biomechanics and Organogenesis, Université Libre de Bruxelles, Bruxelles, Belgium; Laboratory of Functional Anatomy, Université Libre de Bruxelles, Bruxelles, Belgium. Electronic address: bbeyer@ulb.ac.be.
authors.forename: Benoît
authors.initials: B
authors.lastname: Beyer
authors.affiliation: Laboratory of Anatomy, Biomechanics and Organogenesis, Université Libre de Bruxelles, Bruxelles, Belgium; Department of Applied Mathematics, State Polytechnical University (SPbSPU), Saint Petersburg, Russia.
authors.forename: Victor
authors.initials: V
authors.lastname: Sholukha
authors.affiliation: Laboratory of Anatomy, Biomechanics and Organogenesis, Université Libre de Bruxelles, Bruxelles, Belgium.
authors.forename: Patrick
authors.initials: P
authors.lastname: Salvia
authors.affiliation: Laboratory of Anatomy, Biomechanics and Organogenesis, Université Libre de Bruxelles, Bruxelles, Belgium; Laboratory of Functional Anatomy, Université Libre de Bruxelles, Bruxelles, Belgium.
authors.forename: Marcel
authors.initials: M
authors.lastname: Rooze
authors.affiliation: Laboratory of Anatomy, Biomechanics and Organogenesis, Université Libre de Bruxelles, Bruxelles, Belgium; Laboratory of Functional Anatomy, Université Libre de Bruxelles, Bruxelles, Belgium.
authors.forename: Véronique
authors.initials: V
authors.lastname: Feipel
authors.affiliation: Laboratory of Anatomy, Biomechanics and Organogenesis, Université Libre de Bruxelles, Bruxelles, Belgium.
authors.forename: Serge
authors.initials: S
authors.lastname: Van Sint Jan
mesh_terms: D000465:Algorithms; D001175:Arthrography; D001696:Biomechanical Phenomena; D006801:Humans; D007596:Joints / Q000502:physiology*; D008433:Mathematics; D009010:Monte Carlo Method; D016059:Range of Motion, Articular / Q000502:physiology*; D012272:Ribs / Q000000981:diagnostic imaging* / Q000502:physiology; D013131:Spine / Q000000981:diagnostic imaging* / Q000502:physiology; D014057:Tomography, X-Ray Computed / Q000379:methods
keywords: Breathing thorax; Costovertebral joint; Mean helical axis; Monte-Carlo procedure; Pivot point; Rib kinematics