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Multi-segment Musculoskeletal Foot Model | 29744
ISSN: 1662-100X
Journal of Biomimetics Biomaterials and Tissue Engineering
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The difficulties arising in foot modeling are inherent in its complex composition. Most models simplify the foot geometry,
structure, materials and kinetic analysis. To overcome this challenge, in this study a new approach is presented, combining gait
analysis, plantar pressure and image processing together with biomechanical principles to develop a multi-segment foot model.
The model consists of four segments (Phalanges, Midfoot+Metatarsals, Calcaneus, Talus) to represent the foot according to its
function, and a fifth segment for the rest of the body. In order to support the model in terms of geometry and parameterization,
10 series of healthy feet images (X-rays, CT and MRI provided by UHCW consultants) were analyzed. Arch height was calculated
from motion capture experiments (10 subjects) and the ground reaction force distribution throughout the gait cycle was obtained
through plantar pressure analysis on different subjects (14), all experiments complying with data protection requirements. The
plantar soft tissue is modeled as system parallel spring dampers. The model considers four relevant joints: Metatarsophalangeal,
Transversetarsal, Talocalcaneal and Taloclural. Regarding muscle activation, 13 muscles (both extrinsic and intrinsic) are included
using modified Hill muscle model, composed by a contractile element, spring and damper in parallel, to model the muscle, in
series with another spring, the latter to model the free tendon. In order to find a set of fitted parameter values for the stiffness and
damping coefficients, parameter estimation and optimization is applied on per-subject basis, yielding a minimum absolute error
between the measured and simulated trajectories for the model��?s joints.
Biography
Abigail Jaitman is a last year Doctoral candidate at Warwick University, UK. Her main area of research is Biomechanics and how it is affected by diabetes; using electromyography, motion capture, plantar pressure and image processing to support state space models. She holds a 6-year BSc in Electronic Engineering from University of Belgrano, Argentina. Since 2009 she has been doing research on Dosimetry (Medical equipment CONICET UB), and since 2011 is Research Assistant for Dr. Rojas (RSNA & ESR) working on the Mammographic field. She presented at conferences: ECR 2014, PGBiomed/ISC 2014, XIX ICMMB, ECR 2015 and recently published in JMMB.
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