title: Effect of various upper limb multibody models on soft tissue artefact correction: A case study.
abstract: Soft tissue artefacts (STA) introduce errors in joint kinematics when using cutaneous markers, especially on the scapula. Both segmental optimisation and multibody kinematics optimisation (MKO) algorithms have been developed to improve kinematics estimates. MKO based on a chain model with joint constraints avoids apparent joint dislocation but is sensitive to the biofidelity of chosen joint constraints. Since no recommendation exists for the scapula, our objective was to determine the best models to accurately estimate its kinematics. One participant was equipped with skin markers and with an intracortical pin screwed in the scapula. Segmental optimisation and MKO for 24-chain models (including four variations of the scapulothoracic joint) were compared against the pin-derived kinematics using root mean square error (RMSE) on Cardan angles. Segmental optimisation led to an accurate scapula kinematics (1.1°≤RMSE≤3.3°) even for high arm elevation angles. When MKO was applied, no clinically significant difference was found between the different scapulothoracic models (0.9°≤RMSE≤4.1°) except when a free scapulothoracic joint was modelled (1.9°≤RMSE≤9.6°). To conclude, using MKO as a STA correction method was not more accurate than segmental optimisation for estimating scapula kinematics.
authors.affiliation: CIC INSERM 1432, Plateforme d'Investigation Technologique, CHU Dijon, France; Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, F69622 Lyon, France. Electronic address: alexandre.naaim@chu-dijon.fr.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Naaim
authors.affiliation: CNRFR - Rehazenter, Laboratoire d'Analyse du Mouvement et de la Posture, 1 rue André Vésale, L-2674 Luxembourg, Luxembourg.
authors.forename: Florent
authors.initials: F
authors.lastname: Moissenet
authors.affiliation: Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, F69622 Lyon, France; Laboratoire de simulation et de modélisation du mouvement, Département de kinésiologie, Université de Montréal, 1700, rue Jacques Tétreault, Laval, QC H7N 0B6, Canada.
authors.forename: Sonia
authors.initials: S
authors.lastname: Duprey
authors.affiliation: Laboratoire de simulation et de modélisation du mouvement, Département de kinésiologie, Université de Montréal, 1700, rue Jacques Tétreault, Laval, QC H7N 0B6, Canada; Research Center, Sainte-Justine Hospital, 3175 Côte-Ste-Catherine, Montreal, Quebec H3T 1C5, Canada.
authors.forename: Mickaël
authors.initials: M
authors.lastname: Begon
authors.affiliation: Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, F69622 Lyon, France.
authors.forename: Laurence
authors.initials: L
authors.lastname: Chèze
mesh_terms: D000328:Adult; D000465:Algorithms; D016477:Artifacts; D001696:Biomechanical Phenomena; D006801:Humans; D008297:Male; D008954:Models, Biological; D012540:Scapula / Q000502:physiology*; D012785:Shoulder Joint / Q000502:physiology*
keywords: Kinematics model; Multibody kinematics optimisation; Shoulder; Soft tissue artefact; Upper limb