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Validation of the Inverted Pendulum Model in standing for transtibial prosthesis users
Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics. Jönköping University, School of Health and Welfare, HHJ. ADULT. Jönköping University, School of Health and Welfare, HHJ, Dep. of Rehabilitation.ORCID iD: 0000-0002-0220-6278
Jönköping University, School of Health and Welfare, HHJ, Dep. of Rehabilitation. Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics.
2016 (English)In: Clinical Biomechanics, ISSN 0268-0033, E-ISSN 1879-1271, Vol. 31, 100-106 p.Article in journal (Refereed) Published
Abstract [en]

Background: In balance assessment it is often the case that variables associated with center of pressure are used as outcomes to draw conclusions about an individuals balance.  Validity of these outcomes rests upon assumptions that movement of the center of pressure is inter-dependent on movement of the center of mass.  This dependency is mechanical and is referred to as the Inverted Pendulum Model.  As prosthesis users lack an anatomical ankle it is not given this model is valid in this group.  The following study aimed to validate the Inverted Pendulum Model both kinematically and kinetically, in transtibial prosthesis users and a control group.  

Methods: Prosthesis users (n=6) and matched control participants (n=6) stood quietly while force and motion data were collected under three sensory conditions (eyes-open, eyes-closed, and weight-bearing feedback) under both the prosthetic and intact limb.  Correlation coefficients were used to investigate the relationships between height of markers and center of masses and their excursion in the mediolateral/anteroposterior-directions, difference between center of pressure and center of mass and the center of mass acceleration in the mediolateral/anteroposterior directions, magnitude of the mediolateral/anteroposterior-component forces and center of mass acceleration, angular position of ankle and excursion in the mediolateral/anteroposterior-directions, and integrated force signals.  

Findings: Results indicate kinematic validity of similar magnitudes (mean (SD) marker-displacement) between prosthesis users and control group for the mediolateral- (  = 0.77 (0.17); 0.74 (0.19)) and anteroposterior-directions (  = 0.88 (0.18); 0.88 (0.19)).  Correlation between the difference of center of pressure and center of mass and the center of mass acceleration was negligible on the prosthetic side (0.08 (0.06)) vs. the control group (-0.51(0.13)). 

Interpretation: Results indicate kinematic validity of the Inverted Pendulum Model in transtibial prosthesis users but that kinetic validity is questionable, particularly on the side with a prosthesis.

Place, publisher, year, edition, pages
2016. Vol. 31, 100-106 p.
Keyword [en]
Balance, Postural Control, Transtibial, Amputee, Inverted Pendulum Model
National Category
Other Medical Engineering
Identifiers
URN: urn:nbn:se:hj:diva-28059DOI: 10.1016/j.clinbiomech.2015.09.014ISI: 000370092900016PubMedID: 26472063Scopus ID: 2-s2.0-84959526573OAI: oai:DiVA.org:hj-28059DiVA: diva2:857528
Available from: 2015-09-29 Created: 2015-09-29 Last updated: 2017-03-21Bibliographically approved

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