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Theory of the short time mechanical relaxation in articular cartilage.
MedLine Citation:
PMID:  22070338     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Articular cartilage is comprised of macromolecules, proteoglycans, with (charged) chondroitin sulfate side-chains attached to them. The proteoglycans are attached to longer hyaluronic acid chains, trapped within a network of type II collagen fibrils. As a consequence of their relatively long persistence lengths, the number of persistence lengths along the chondroitin sulfate and proteoglycan chains is relatively small, and consequently, the retraction times for these side chains are also quite short. We argue that, as a consequence of this, they will not significantly inhibit the reptation of the hyaluronic acid chains. Scaling arguments applied to this model allow us to show that the shortest of the mechanical relaxation times of cartilage, that have been determined by Fyhrie and Barone to be due to reptation of the hyaluronic acid polymers, should have a dependence on the load, i.e., force per unit interface area P, carried by the cartilage, proportional to P(3/2).
Authors:
J W Ruberti; J B Sokoloff
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biomechanical engineering     Volume:  133     ISSN:  1528-8951     ISO Abbreviation:  J Biomech Eng     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-11-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7909584     Medline TA:  J Biomech Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  104504     Citation Subset:  IM    
Affiliation:
Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115.
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