Document Detail

Are external knee load and EMG measures accurate indicators of internal knee contact forces during gait?
MedLine Citation:
PMID:  23280647     Owner:  NLM     Status:  MEDLINE    
Mechanical loading is believed to be a critical factor in the development and treatment of knee osteoarthritis. However, the contact forces to which the knee articular surfaces are subjected during daily activities cannot be measured clinically. Thus, the ability to predict internal knee contact forces accurately using external measures (i.e., external knee loads and muscle electromyographic [EMG] signals) would be clinically valuable. We quantified how well external knee load and EMG measures predict internal knee contact forces during gait. A single subject with a force-measuring tibial prosthesis and post-operative valgus alignment performed four gait patterns (normal, medial thrust, walking pole, and trunk sway) to induce a wide range of external and internal knee joint loads. Linear regression analyses were performed to assess how much of the variability in internal contact forces was accounted for by variability in the external measures. Though the different gait patterns successfully induced significant changes in the external and internal quantities, changes in external measures were generally weak indicators of changes in total, medial, and lateral contact force. Our results suggest that when total contact force may be changing, caution should be exercised when inferring changes in knee contact forces based on observed changes in external knee load and EMG measures. Advances in musculoskeletal modeling methods may be needed for accurate estimation of in vivo knee contact forces.
Andrew J Meyer; Darryl D D'Lima; Thor F Besier; David G Lloyd; Clifford W Colwell; Benjamin J Fregly
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2012-12-31
Journal Detail:
Title:  Journal of orthopaedic research : official publication of the Orthopaedic Research Society     Volume:  31     ISSN:  1554-527X     ISO Abbreviation:  J. Orthop. Res.     Publication Date:  2013 Jun 
Date Detail:
Created Date:  2013-04-16     Completed Date:  2013-06-13     Revised Date:  2014-06-03    
Medline Journal Info:
Nlm Unique ID:  8404726     Medline TA:  J Orthop Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  921-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Orthopaedic Research Society.
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MeSH Terms
Aged, 80 and over
Biomechanical Phenomena
Knee Joint / physiology*
Regression Analysis
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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