Article Text
Abstract
Background: Although obesity is widely accepted as a risk factor for knee osteoarthritis, whether weight per se or the specific components of body composition are the major determinants of properties of articular knee cartilage is unclear.
Objective: To examine associations between anthropometric and body composition measures and knee cartilage properties in healthy adults.
Methods: 297 healthy adults with no clinical knee osteoarthritis were recruited from an existing community-based cohort. Anthropometric measures and body composition, including fat-free mass and fat mass assessed using bioelectrical impedance analysis, were measured at baseline (1990–4) and current follow-up (2003–4). Tibial cartilage volume and tibiofemoral cartilage defects were assessed using MRI at follow-up.
Results: After adjustment for potential confounders, baseline and current fat-free mass, independent of fat mass, were positively associated with tibial cartilage volume (all p<0.001). Increased fat-free mass over the time period was positively associated with tibial cartilage volume (p<0.001). Current fat mass was negatively associated with tibial cartilage volume (p = 0.004). Baseline and current fat mass were weakly associated with increased tibiofemoral cartilage defects (p = 0.06 and p = 0.07, respectively), independent of fat-free mass.
Conclusion: The findings suggest a beneficial effect of fat-free mass, but a deleterious effect of fat mass, on knee cartilage properties in healthy adults. This suggests that weight-loss programmes aimed at reducing fat mass but maintaining muscle mass may be important in preventing the onset and/or progression of knee osteoarthritis.
- BMI, body mass index
- FFM, fat-free mass
- FM, fat mass
- MCCS, Melbourne Collaborative Cohort Study
- OA, osteoarthritis
- WHR, waist-to-hip ratio
- fat-free mass
- fat mass
- cartilage
- cartilage defects
- osteoarthritis
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Footnotes
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Published Online First 29 January 2007
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This study was funded by a programme grant from the National Health and Medical Research Council (NHMRC; 209057) and was further supported by infrastructure provided by The Cancer Council of Victoria. This study was also supported by NHMRC (project grant 334150), Colonial Foundation and Shepherd Foundation. YW is the recipient of an NHMRC PhD Scholarship. AEW is the recipient of an NHMRC Public Health Fellowship and co-recipient of the Cottrell Fellowship, Royal Australasian College of Physicians.
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Competing interests: None.