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Validation of the Inverted Pendulum Model in standing for transtibial prosthesis users
Jönköping University, Jönköping, Sweden.
Jönköping University, Jönköping, Sweden.
2016 (English)In: Clinical Biomechanics, ISSN 0268-0033, E-ISSN 1879-1271, Vol. 31, p. 100-106Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Often in balance assessment variables associated with the center of pressure are used to draw conclusions about an individual's balance. Validity of these conclusions 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. The following study aimed to validate this 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 conditions (eyes-open, eyes-closed, and weight-bearing feedback). Correlation coefficients were used to investigate the relationships between height and excursion of markers and center of masses in mediolateral/anteroposterior-directions, difference between center of pressure and center of mass and the center of mass acceleration in mediolateral/anteroposterior directions, magnitude of mediolateral/anteroposterior-component forces and center of mass acceleration, angular position of ankle and excursion in 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 mediolateral- (r=0.77 (0.17); 0.74 (0.19)) and anteroposterior-directions (r=0.88 (0.18); 0.88 (0.19)). Correlation between difference of center of pressure and center of mass and the center of mass acceleration was negligible on the prosthetic side (r = 0.08 (0.06)) vs. control group (r=-0.51(0.13)).

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

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 31, p. 100-106
Keywords [en]
Amputee, Balance, Inverted Pendulum Model, Postural control, Transtibial
National Category
Medical and Health Sciences Orthopaedics
Identifiers
URN: urn:nbn:se:oru:diva-83689DOI: 10.1016/j.clinbiomech.2015.09.014ISI: 000370092900016PubMedID: 26472063Scopus ID: 2-s2.0-84959526573OAI: oai:DiVA.org:oru-83689DiVA, id: diva2:1447778
Available from: 2020-06-26 Created: 2020-06-26 Last updated: 2020-08-14Bibliographically approved

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Ramstrand, Simon

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