A practical solution to reduce soft tissue artifact error at the knee using adaptive kinematic constraints |
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| Institution: | 1. Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario, Canada;2. School of Rehabilitation Sciences, University of Ottawa, Ottawa, Ontario, Canada;3. School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada;1. Department of Mechanical and Materials Engineering, Queen’s University, McLaughlin Hall, Kingston, Ontario K7L 3N6, Canada;2. Department of Mechanical Engineering, University of Wisconsin, 1513 University Ave, Madison, WI 53706, USA;1. Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers ParisTech, 151 boulevard de l''Hôpital, F-75013 Paris, France;2. Hugh Williamson Gait Analysis Laboratory, The Royal Children’s Hospital, 50 Flemington Road, Parkville Victoria, 3052 Melbourne, Australia;3. The Murdoch Children’s Research Institute, Melbourne, Australia;1. LISSI, University of Paris-Est-Créteil, France;2. Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, UMR_T9406, LBMC, F69622 Lyon, France;3. Department of Movement, Human and Health Sciences, Università degli Studi di Roma “Foro Italico”, Rome, Italy;4. Interuniversity Centre of Bioengineering of the Human Neuromusculoskeletal System, Università degli Studi di Roma “Foro Italico”, Rome, Italy;5. Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Japan;1. Laboratory of Movement Analysis and Measurement, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland;2. Laboratoire de recherche en imagerie et orthopédie, Centre de recherche du Centre Universitaire Hospitalier de Montréal, École de technologie supérieure, Montréal, Canada;3. Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, F69622 Lyon, France;4. Interuniversity Centre of Bioengineering of the Human Neuromusculoskeletal System, Università degli Studi di Roma “Foro Italico”, Rome, Italy;1. Université de Lyon, F-69622, Lyon; IFSTTAR, LBMC, UMR_T9406, Bron; Université Lyon 1, Villeurbanne, France;2. Department of Movement, Human and Health Sciences, Università degli Studi di Roma “Foro Italico”, Rome, Italy;1. Université de Lyon, université Lyon 1, Laboratoire Interuniversitaire de Biologie de la motricité, Villeurbanne, France;2. Laboratoire de Simulation et Modélisation du Mouvement, Département de Kinésiologie, Université de Montréal, Montréal, QC, Canada;3. Centre de Recherche du Centre Hospitalier Universitaire Sainte-Justine, Montréal, QC, Canada;4. Université Lyon 1, Villeurbanne, France;5. IFSTTAR, LBMC, UMR_T9406, Bron, France;6. Université de Lyon, Lyon, France;7. Karolinska Institute, Stockholm, Sweden |
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| Abstract: | Musculoskeletal modeling and simulations have vast potential in clinical and research fields, but face various challenges in representing the complexities of the human body. Soft tissue artifact from skin-mounted markers may lead to non-physiological representation of joint motions being used as inputs to models in simulations. To address this, we have developed adaptive joint constraints on five of the six degree of freedom of the knee joint based on in vivo tibiofemoral joint motions recorded during walking, hopping and cutting motions from subjects instrumented with intra-cortical pins inserted into their tibia and femur. The constraint boundaries vary as a function of knee flexion angle and were tested on four whole-body models including four to six knee degrees of freedom. A musculoskeletal model developed in OpenSim simulation software was constrained to these in vivo boundaries during level gait and inverse kinematics and dynamics were then resolved. Statistical parametric mapping indicated significant differences (p < 0.05) in kinematics between bone pin constrained and unconstrained model conditions, notably in knee translations, while hip and ankle flexion/extension angles were also affected, indicating the error at the knee propagates to surrounding joints. These changes to hip, knee, and ankle kinematics led to measurable changes in hip and knee transverse plane moments, and knee frontal plane moments and forces. Since knee flexion angle can be validly represented using skin mounted markers, our tool uses this reliable measure to guide the five other degrees of freedom at the knee and provide a more valid representation of the kinematics for these degrees of freedom. |
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| Keywords: | Musculoskeletal modeling Kinematics Soft tissue artifact Knee joint In vivo |
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