Abstract
Summary
Although bone mineral density (BMD) is decreased and fracture risk increased in anorexia nervosa, BMD does not predict fracture history in this disorder. We assessed BMD, bone microarchitecture, and bone marrow adipose tissue (BMAT) in women with anorexia nervosa and found that only BMAT was associated with fracture history.
Introduction
Anorexia nervosa (AN) is a psychiatric disorder characterized by low body weight, low BMD, and increased risk of fracture. Although BMD is reduced and fracture risk elevated, BMD as assessed by DXA does not distinguish between individuals with versus those without prior history of fracture in AN. Despite having decreased peripheral adipose tissue stores, individuals with AN have enhanced bone marrow adipose tissue (BMAT), which is inversely associated with BMD. Whether increased BMAT is associated with fracture in AN is not known.
Methods
We conducted a cross-sectional study in 62 premenopausal women, including 34 with AN and 28 normal-weight women of similar age. Fracture history was collected during patient interviews and BMD measured by DXA, BMAT by 1H-MRS, and parameters of bone microarchitecture by HR-pQCT.
Results
Sixteen women (47.1%) with AN reported prior history of fracture compared to 11 normal-weight women (39.3%, p = 0.54). In the entire group and also the subset of women with AN, there were no significant differences in BMD or parameters of bone microarchitecture in women with prior fracture versus those without. In contrast, women with AN with prior fracture had greater BMAT at the spine and femur compared to those without (p = 0.01 for both).
Conclusion
In contrast to BMD and parameters of bone microarchitecture, BMAT is able to distinguish between women with AN with prior fracture compared to those without. Prospective studies will be necessary to understand BMAT’s potential pathophysiologic role in the increased fracture risk in AN.
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Acknowledgements
We would like to thank the nurses and bionutritionists of the MGH Translational and Clinical Research Center for their expert care. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Center for Research Resources or the National Institutes of Health.
Funding
This work was supported in part by the following grants from the National Institutes of Health:
• UL 1TR002541 (The Harvard Clinical and Translational Science Center, National Center for Advancing Translational Sciences)
• UL1 RR025758 (Harvard Clinical and Translational Science Center)
• 1S10RR023405 (National Center for Research Resources)
• NIH grants: R24 DK084970, P30 DK040561, K24DK109940, R01 HD099139
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PKF is a consultant for Regeneron and Strongbridge Biopharma. Tran Dang, Alexander Faje, Erinne Meenaghan, Miriam Bredella, Mary Bouxsein and Anne Klibanski declare they have no conflict of interest.
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Dang, T., Faje, A.T., Meenaghan, E. et al. Bone marrow adipose tissue is associated with fracture history in anorexia nervosa. Osteoporos Int 33, 2619–2627 (2022). https://doi.org/10.1007/s00198-022-06527-3
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DOI: https://doi.org/10.1007/s00198-022-06527-3