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A generic analytical foot rollover model for predicting translational ankle kinematics in gait simulation studies

Ren, L, Howard, D, Ren, L, Nester, CJ and Tian, L 2010, 'A generic analytical foot rollover model for predicting translational ankle kinematics in gait simulation studies' , Journal of Biomechanics, 43 (2) , pp. 194-202.

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    Abstract

    The objective of this paper is to develop an analytical framework to representing the ankle-foot kinematics by modelling the foot as a rollover rocker, which cannot only be used as a generic tool for general gait simulation but also allows for case-specific modelling if required. Previously, the rollover models used in gait simulation have often been based on specific functions that have usually been of a simple form. In contrast, the analytical model described here is in a general form that the effective foot rollover shape can be represented by any polar function p=p(o). Furthermore, a normalised generic foot rollover model has been established based on a normative foot rollover shape dataset of 12 normal healthy subjects. To evaluate model accuracy, the predicted ankle motions and the centre of pressure (CoP) were compared with measurement data for both subject-specific and general cases. The results demonstrated that the ankle joint motions in both vertical and horizontal directions (relative RMSE ~10%) and CoP (relative RMSE ~ 15% for most of the subjects) are accurately predicted over most of the stance phase (from 10% to 90% of stance). However, we found that the foot cannot be very accurately represented by a rollover model just after heel strike (HS) and just before toe off (TO), probably due to shear deformation of foot plantar tissues (ankle motion can occur without any foot rotation). The proposed foor rollover model can be used in both inverse and forward dynamics gait simulation studies and may also find applications in rehabilitation engineering.

    Item Type: Article
    Uncontrolled Keywords: Footmodel, ankle, rocker, gait simulation
    Themes: Health and Wellbeing
    Schools: Colleges and Schools > College of Health & Social Care > School of Health Sciences > Centre for Health Sciences Research
    Colleges and Schools > College of Health & Social Care
    Colleges and Schools > College of Health & Social Care > School of Health Sciences
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > CASE Control & Systems Engineering Research Centre
    Journal or Publication Title: Journal of Biomechanics
    Publisher: Elsevier
    Refereed: Yes
    ISSN: 00219290
    Depositing User: RH Shuttleworth
    Date Deposited: 12 May 2011 11:06
    Last Modified: 14 Jul 2014 14:22
    URI: http://usir.salford.ac.uk/id/eprint/15769

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