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What is the effect of physical activity on the knee joint? A systematic review.
MedLine Citation:
PMID:  20631641     Owner:  NLM     Status:  In-Data-Review    
PURPOSE: : Although several studies have examined the relationship between physical activity and knee osteoarthritis, the effect of physical activity on knee joint health is unclear. The aim of this systematic review was to examine the relationships between physical activity and individual joint structures at the knee.
METHODS: : Computer-aided searches were conducted up until November 2008, and the reference lists of key articles were examined. The methodological quality of selected studies was assessed based on established criteria, and a best-evidence synthesis was used to summarize the results.
RESULTS: : We found that the relationships between physical activity and individual joint structures at the knee differ. There was strong evidence for a positive association between physical activity and tibiofemoral osteophytes. However, we also found strong evidence for the absence of a relationship between physical activity and joint space narrowing, a surrogate method of assessing cartilage. Moreover, there was limited evidence from magnetic resonance imaging studies for a positive relationship between physical activity and cartilage volume and strong evidence for an inverse relationship between physical activity and cartilage defects.
CONCLUSIONS: : This systematic review found that knee structures are affected differently by physical activity. Although physical activity is associated with an increase in radiographic osteophytes, there was no related increase in joint space narrowing, rather emerging evidence of an associated increase in cartilage volume and decrease in cartilage defects on magnetic resonance imaging. Given that optimizing cartilage health is important in preventing osteoarthritis, these findings indicate that physical activity is beneficial, rather than detrimental, to joint health.
Donna M Urquhart; Jephtah F L Tobing; Fahad S Hanna; Patricia Berry; Anita E Wluka; Changhai Ding; Flavia M Cicuttini
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  43     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-02-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  432-42     Citation Subset:  IM; S    
1School of Public Health and Preventive Medicine, Department of Epidemiology and Preventive Medicine, Monash University, Alfred Hospital, Melbourne, Victoria, AUSTRALIA; 2Baker Heart Research Institute, Melbourne, Victoria, AUSTRALIA; and 3Menzies Research Institute, Hobart, Tasmania, AUSTRALIA.
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