Bone marrow adipose amount influences vertebral bone strength.
Mo Zhu1, Guangyu Hao1, Jianming Xing1
1Department of Radiology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, P.R. China.
Experimental and Therapeutic Medicine
|January 18, 2019
Summary
Osteoporotic rats show increased bone marrow fat and altered microstructure over time. These changes correlate with reduced bone strength, highlighting fracture risks.
Area of Science:
- Biomedical Engineering
- Osteoporosis Research
- Medical Imaging
Background:
- Osteoporosis is characterized by decreased bone mass and microarchitectural deterioration.
- Bone marrow adipose tissue (BMAT) is increasingly recognized as a factor influencing bone health.
- Non-invasive imaging techniques are crucial for evaluating bone changes in osteoporosis.
Purpose of the Study:
- To investigate the association between bone marrow adipose tissue and bone microstructure with bone strength in an osteoporotic rat model.
- To evaluate the utility of MR Dixon analysis and micro-computed tomography (micro-CT) in assessing these relationships.
Main Methods:
- Forty female Sprague-Dawley rats were ovariectomized (OVX) or sham-operated (SHAM).
- MR Dixon analysis was used to measure bone marrow fat fraction (FF) longitudinally.
- Micro-CT and biomechanical testing were performed on lumbar vertebrae post-sacrifice.
Main Results:
- Ovariectomized rats exhibited a significant time-dependent increase in bone marrow fat fraction (FF).
- Increased FF correlated with detrimental changes in bone microstructure parameters.
- Higher FF showed a negative correlation with bone strength metrics, including break stress and elastic modulus.
Conclusions:
- Bone marrow adipose tissue content, quantified by MR Dixon, is associated with bone microstructure changes in osteoporosis.
- These findings suggest that increased bone marrow fat contributes to the decline in bone strength and increased fracture risk in osteoporotic rats.
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