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A method for measuring external spinal loads during unconstrained free-dynamic lifting.

Authors
Fathallah-FA; Marras-WS; Parnianpour-M; Granata-KP
Source
J Biomech 1997 Sep; 30(9):975-978
NIOSHTIC No.
20033067
Abstract
Biomechanical lifting models often require the knowledge of the applied trunk moments and forces for model validation purposes and/or to determine loading levels experienced at various joints of the body. Trunk kinetic data under dynamic exertions are commonly difficult to attain without restrictive anatomic/anthropometric assumptions and cost or constraining body motion. The main objectives of the study were to present a new technique for determining continuous three-dimensional forces and moments about the L5/S1 spinal joint, and to validate the technique and assess its applicability under lifting situations. A combination of a force plate and two electrogoniometers facilitated the determination of trunk kinetics about L5/S1. An apparatus was devised to allow the application of various actual moments that were compared to their corresponding predicted moments. The results showed that, over all the conditions considered, the average percent error in estimating the actual applied moment(s) was about 4% (2.3 S.D.), with a test-retest reliability approaching unity. Given such agreement, along with the relative ease and directness of the method, it is believed that this approach should be applicable under most lifting conditions. The technique offers a fairly accurate measure of trunk moments without the need for constraining the motion of any body joint.
Keywords
Spinal-cord; Spinal-cord-disorders; Spinal-shock; Biomechanical-engineering; Biomechanical-modeling; Biomechanics; Biomedical-engineering; Weight-factors; Job-analysis; Body-mechanics; Body-protection; Body-weight; Kinetics; Anthropometry
Contact
Fadi Fathallah, Liberty Mutual Research Center, 71 Frankland Road, , Hopkinton, MA 01748, , USA
CODEN
JBMCB5
Publication Date
19970901
Document Type
Journal Article
Funding Amount
1055222
Funding Type
Cooperative Agreement
Fiscal Year
1997
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U07-CCU-906162
Issue of Publication
9
ISSN
0021-9290
Source Name
Journal of Biomechanics
State
OH; CA
Performing Organization
University of California - Davis
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