Document Detail

Ligament material behavior is nonlinear, viscoelastic and rate-independent under shear loading.
MedLine Citation:
PMID:  12052396     Owner:  NLM     Status:  MEDLINE    
The material behavior of ligament is determined by its constituents, their organization and their interaction with each other. To elucidate the origins of the multiaxial material behavior of ligaments, we investigated ligament response to shear loading under both quasi-static and rate-dependent loading conditions. Stress relaxation tests demonstrated that the tissue was highly viscoelastic in shear, with peak loads dropping over 40% during 30 min of stress relaxation. The stress relaxation response was unaffected by three decades of change in shear strain rate (1.3, 13 and 130%/s). A novel parameter estimation technique was developed to determine material coefficients that best described the experimental response of each test specimen to shear. The experimentally measured clamp displacements and reaction forces from the simple shear tests were used with a nonlinear optimization strategy based around function evaluations from a finite element program. A transversely isotropic material with an exponential matrix strain energy provided an excellent fit to experimental load-displacement curves. The shear modulus of human MCL showed a significant increase with increasing shear strain (p<0.001), reaching a maximum of 1.72+/-0.4871 MPa. The results obtained from this study suggest that viscoelasticity in shear does not likely result from fluid flow. Gradual loading of transversely oriented microstructural features such as intermolecular collagen crosslinks or collagen-proteoglycan crosslinking may be responsible for the stiffening response under shear loading.
Jeffrey A Weiss; John C Gardiner; Carlos Bonifasi-Lista
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of biomechanics     Volume:  35     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2002 Jul 
Date Detail:
Created Date:  2002-06-07     Completed Date:  2002-09-18     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  943-50     Citation Subset:  IM    
Department of Bioengineering, The University of Utah, 50 S Central Campus Drive, Rm #2480, Salt Lake City, UT 84112, USA.
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MeSH Terms
Ligaments / physiology*
Middle Aged
Models, Biological
Nonlinear Dynamics
Stress, Mechanical
Grant Support

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