Abstract
Bone of normal quality and quantity can successfully endure physiologically imposed mechanical loads. Chronic kidney disease–mineral and bone disorder (CKD–MBD) adversely affects bone quality through alterations in bone turnover and mineralization, whereas bone quantity is affected through changes in bone volume. Changes in bone quality can be associated with altered bone material, structure, or microdamage, which can result in an elevated rate of fracture in patients with CKD–MBD. Fractures cannot always be explained by reduced bone quantity and, therefore, bone quality should be assessed with a variety of techniques from the macro-organ level to the nanoscale level. In this Review, we demonstrate the importance of evaluating bone from multiple perspectives and hierarchical levels to understand CKD–MBD-related abnormalities in bone quality. Understanding the relationships between variations in material, structure, microdamage, and mechanical properties of bone in patients with CKD–MBD should aid in the development of new modalities to prevent, or treat, these abnormalities.
Key Points
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Chronic kidney disease–mineral and bone disorder (CKD–MBD) is accompanied by histological bone changes (encompassing abnormalities in bone turnover, mineralization, and volume) called renal osteodystrophy
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Loss of bone quantity (mass) can increase fracture susceptibility, but loss of mass alone is insufficient to explain the increased occurrence of fractures, suggesting bone quality is also involved
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Bone quality, the ability to perform the mechanical functions needed, can be evaluated on various levels to quantify the structural, material, and microdamage parameters influencing the load-bearing capabilities of bone
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Abnormalities in bone structure, materials, and microdamage are associated with reduced bone-quality metrics; notably, abnormal bone modulus, strength, and toughness and can be observed in patients with CKD–MBD
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Current therapies address changes in bone turnover, mineralization, and volume; consideration should also be given to reversal of abnormalities known to influence the load-bearing capabilities of bone
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Acknowledgements
We acknowledge support from the NIH under grants RO1 DK080770 and RO1 AR061578. We also acknowledge support from the Kentucky Nephrology Research Trust.
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H. H. Malluche, D. S. Porter and D. Pienkowski researched data for the article, reviewed and discussed the literature and obtained data, and wrote and edited the article.
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Malluche, H., Porter, D. & Pienkowski, D. Evaluating bone quality in patients with chronic kidney disease. Nat Rev Nephrol 9, 671–680 (2013). https://doi.org/10.1038/nrneph.2013.198
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DOI: https://doi.org/10.1038/nrneph.2013.198