Document Detail

Dynamic measurement of internal solid displacement in articular cartilage using ultrasound backscatter.
MedLine Citation:
PMID:  12594992     Owner:  NLM     Status:  MEDLINE    
Mechanics of articular cartilage can be represented using poroelastic theories where fluid and solid displacements are viscously coupled to create a time-dependent spatially heterogeneous behavior. In recent models of this tissue, finite element methods have been used to predict tissue deformation as a function of time for adult articular cartilage bearing a characteristic depth-dependent structure and composition. However, current experimental methods are limited in providing verification of these predictions. The current study presents an apparatus for imaging the radial displacement profile of cartilage in unconfined compression using an ultrasound technique called elastography. We acquired ultrasound A-scans across the lateral diameter of full-thickness cartilage disks containing a thin layer of underlying bone, during axial compression. Elastography was then applied to correlate temporally sequential A-scans to estimate the solid radial displacement profile in articular cartilage while it undergoes compression and stress-relaxation. Both time-dependent and depth-dependent solid radial displacement profiles were obtained with a precision better than 0.2 micro The results generally agree with predictions of poroelastic models, demonstrating lateral expansion with an effective Poisson's ratio just after completion of the compression phase of the mechanical tests reaching values from 0.18 to 0.4 (depending on compression speed), followed by contraction to lower values. A more restricted movement was observed at both the articular surface and near to the subchondral bone than at regions midway between these two locations.
Manuel Fortin; Michael D Buschmann; Michel J Bertrand; F Stuart Foster; Jonathan Ophir
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of biomechanics     Volume:  36     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2003 Mar 
Date Detail:
Created Date:  2003-02-21     Completed Date:  2003-07-02     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  443-7     Citation Subset:  IM    
Department of Chemical Engineering, Institute of Biomedical Engineering, Ecole Polytechnique de Montreal, P.O.Box 6079, Station Centre-Ville, Que., H3C 3A7, Montreal, Canada.
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MeSH Terms
Cartilage, Articular / physiology*,  ultrasonography*
Humerus / physiology
Scattering, Radiation
Sensitivity and Specificity
Stress, Mechanical
Ultrasonography / methods*

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