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J Bone Miner Res, 2020; 35(3): 516-527, PMID: 31675452

Bone Marrow and Muscle Fat Infiltration are Correlated Among Postmenopausal Women with Osteoporosis: the AMBERS Cohort Study.

Jahr: 2020

Wong AK, Chandrakumar A, Whyte R, Reitsma S, Gillick H, Pokhoy A, Papaioannou A, Adachi JD
CESHA, Joint Department of Medical Imaging, University Health Network, Toronto, ON, Canada.

Abstract

Bone and muscle have shown to interact, but little is known about fat within bone and muscle. Clinical studies have isolated fat within bone and muscle using MRI. In this cross-sectional study, we hypothesized that bone marrow adiposity and muscle adiposity are related, and that this relationship is associated with osteoporosis. Postmenopausal women 60-85 years of age were recruited as part of the Appendicular Muscle and Bone Extension Research Study (AMBERS). Participants completed DXA of the hip and spine to diagnose osteoporosis. Muscle adiposity was measured with MRI at the 66% site of the leg. Fat segmentation was achieved using a semi-automated iterative threshold-optimizing algorithm (error<5%). Peripheral quantitative computed tomography measured marrow density of the 4% distal tibia (surrogate for marrow fat) by threshold-based, edge-detection segmentations and by examining residuals from trabecular bone density regressed on trabecular tissue mineral density. Muscle adiposity from MRI was regressed on marrow density using linear regression. Models were further examined with an interaction with osteoporosis status. Among 312 women (age: 75.4+/-5.9yrs, BMI: 29.5+/-5.7kg/m(2) ), a larger amount of muscle fat was associated with lower marrow density at the 66% mid-tibia (B: 84.08(27.56), p=0.002) and at the 4% distal tibia (B: 129.17(55.96), p=0.022) after accounting for age, height, weight, average daily energy expenditure, hypertension and diabetes. Interactions of this relationship with osteoporosis status were also significant. Upon probing these interactions, the relationships were significant only in women with osteoporosis, but not in those without osteoporosis. Fat from bone marrow and muscle may be related to one another through the same phenomenon, which is likely also responsible for osteoporosis, but independent of hypertension and diabetes. More research should focus on the potential abnormalities in muscle and bone fat metabolism and mesenchymal cell commitment to fat within patients with osteoporosis. This article is protected by copyright. All rights reserved.

GID: 4995; Letzte Änderung: 19.11.2019