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Measured and estimated ground reaction forces for multi-segment foot models.

Authors
Bruening-DA; Cooney-KM; Buczek-FL; Richards-JG
Source
J Biomech 2010 Dec; 43(16):3222-3226
NIOSHTIC No.
20037701
Abstract
Accurate measurement of ground reaction forces under discrete areas of the foot is important in the development of more advanced foot models, which can improve our understanding of foot and ankle function. To overcome current equipment limitations, a few investigators have proposed combining a pressure mat with a single force platform and using a proportionality assumption to estimate subarea shear forces and free moments. In this study, two adjacent force platforms were used to evaluate the accuracy of the proportionality assumption on a three segment foot model during normal gait. Seventeen right feet were tested using a targeted walking approach, isolating two separate joints: transverse tarsal and metatarsophalangeal. Root mean square (RMS) errors in shear forces up to 6% body weight (BW) were found using the proportionality assumption, with the highest errors (peak absolute errors up to 12% BW) occurring between the forefoot and toes in terminal stance. The hallux exerted a small braking force in opposition to the propulsive force of the forefoot, which was unaccounted for by the proportionality assumption. While the assumption may be suitable for specific applications (e.g. gait analysis models), it is important to understand that some information on foot function can be lost. The results help highlight possible limitations of the assumption. Measured ensemble average subarea shear forces during normal gait are also presented for the first time.
Keywords
Foot-disorders; Force; Walking-surfaces; Skeletal-movement; Motion-studies; Body-weight; Body-mechanics; Biomechanical-modeling; Biomechanics; Kinetics; Measurement-equipment; Humans; Musculoskeletal-system; Pathology; Author Keywords: Ground reaction force; Shear force; Plantar shear; Foot model; Multi-segment foot
Contact
Dustin A.Bruening, Shriners Hospitals for Children, 1645 W. 8th St., Erie, PA 16509, USA
CODEN
JBMCB5
Publication Date
20101201
Document Type
Journal Article
Email Address
dbruening@shrinenet.org
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Issue of Publication
16
ISSN
0021-9290
NIOSH Division
HELD
Source Name
Journal of Biomechanics
State
PA; WV; DE
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