Abstract
Background
In individuals with knee osteoarthritis (OA), fatty infiltration into thigh muscle is associated with poor physical performance and strength. However, it is not known whether this also occurs in the calf and if this impacts physical function.
Aims
We investigated the relationships between volumes of intramuscular fat (intraMF), intermuscular fat (IMF), subcutaneous fat (SCF), lean muscle and muscle adiposity, in the thighs compared to the calves of women with knee OA.
Methods
MRI scans of the thigh and calf were acquired from 20 women over 55 years with knee OA (3.0T Discovery MR750, GE Healthcare). Axial IDEAL (iterative decomposition of water and fat with echo asymmetry and least-squares estimation) fat-separated images were segmented to quantify intraMF, IMF, SCF and lean muscle volumes (SliceOmatic 5.0, Tomovision). Correlation and linear regression analyses were run.
Results
We found a positive relationship between thigh and calf intraMF (R 2 = 0.592; B = 5.49; p = 0.001), muscle adiposity (R 2 = 0.539; B = 0.567; p = 0.001), and SCF volume (R 2 = 0.699; B = 12.847; p = 0.001), controlling for waist-to-hip ratio. Relationships between thigh and calf IMF (R 2 = 0.239; B = 7.743; p = 0.061), lean muscle (R 2 = 0.245; B = 4.149; p = 0.047) and combined intraMF and IMF volume (R 2 = 0.242; B = 6.162; p = 0.044) were not significant.
Discussion
Although a correlation exists between thigh and calf muscle adiposity, intraMF and SCF, this does not hold true for IMF or lean muscle. A greater amount of intraMF infiltration occurs in the thigh compared to the calf of women with knee OA.
Conclusion
The calf and thigh may both be involved in pathologic changes in muscle composition in knee OA.
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Acknowledgments
Michael J. Davison’s Master of Science education research was supported by McMaster University Department of Medicine’s Graduate Research Initiative, the Natural Sciences and Engineering Council of Canada (MRM) and the Canadian Foundation for Innovation and the Ontario Ministry of Research and Innovation (MRM).
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All procedures performed in this study involving human participants were in accordance with the ethical standards of the Hamilton Integrated Research Ethics Board and with the 1964 Helsinki declaration and its later amendments.
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Informed consent was obtained from all individual participants included in the study.
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Davison, M.J., Maly, M.R., Adachi, J.D. et al. Relationships between fatty infiltration in the thigh and calf in women with knee osteoarthritis. Aging Clin Exp Res 29, 291–299 (2017). https://doi.org/10.1007/s40520-016-0556-z
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DOI: https://doi.org/10.1007/s40520-016-0556-z