A practical solution to reduce soft tissue artifact error at the knee using adaptive kinematic constraints.

Autor: Potvin BM; Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario, Canada., Shourijeh MS; Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario, Canada; School of Rehabilitation Sciences, University of Ottawa, Ottawa, Ontario, Canada., Smale KB; School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada., Benoit DL; Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario, Canada; School of Rehabilitation Sciences, University of Ottawa, Ottawa, Ontario, Canada; School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada. Electronic address: dbenoit@uottawa.ca.
Jazyk: angličtina
Zdroj: Journal of biomechanics [J Biomech] 2017 Sep 06; Vol. 62, pp. 124-131. Date of Electronic Publication: 2017 Feb 21.
DOI: 10.1016/j.jbiomech.2017.02.006
Abstrakt: 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.
(Copyright © 2017 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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