Abstract
Introduction
Monoclonal gammopathy of uncertain significance (MGUS) is highly prevalent in older adults and affects bone structure, with osteoporosis and increased risk of fractures in up to 14% of affected patients. Dual-energy X-ray absorptiometry (DXA), the standard technique for diagnosing osteoporosis, is ineffective to reveal microstructure and bone quality in this disease.
Materials and methods
We conducted a cross-sectional study of patients with MGUS, recruited consecutively from the Hematology and Internal Medicine Departments of Hospital del Mar, Barcelona, between January 2011 and January 2018. Medical records, clinical results and spinal X-ray images were collected. Bone mineral density (BMD) at hip and spine was measured by DXA and Bone Material Strength index (BMSi) by impact microindentation on the tibial mid-shaft.
Results
Thirty-nine patients with MGUS and 65 age-matched controls without previous fractures were included. In the MGUS group, 11 (28.2%) patients had prevalent fractures, nearly half of them vertebral (n = 5, 45.45%). Compared to controls, MGUS patients had significantly lower BMSi, a mean (SD) of 70.72 (9.70) vs. 78.29 (8.70), p = 0.001, and lower spinal BMD values (0.900 [0.159] vs. 1.003 [0.168], respectively, p = 0.012), but no significant differences at femoral neck and total hip. No association was observed between BMSi and DXA. Bone remodeling markers (procollagen type-1 N propeptide, bone-alkaline phosphatase and C-terminal telopeptide of type I collagen) did not differ between the two groups.
Conclusions
Spinal BMD and mechanical properties of bone tissue, as measured by impact microindentation, were impaired in patients with MGUS. These changes in bone tissue mechanical resistance were independent of DXA levels.
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Acknowledgements
We would like to thank Natalia Garcia Giralt, MD, PhD, for her valuable help in the laboratory measurements; Elaine Lilly, PhD, and Valentina Ferreira-Orduna for English language revision. The research leading to these results has been sponsored in part by CIBERFES, Instituto Carlos III, Spanish Ministry of Science, Innovation and Universities and FEDER funds.
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Study design: LM and GO. Study contact: GO and XN. Study conduct: GO, LM, XN and ADP. Data collection: EA, LM and GO. Data analysis: RG, MP, DPA, GO and ADP. Data interpretation: ADP, GO, LM and XN. Drafting manuscript: GO, LM, XN and ADP. Revising manuscript content: All authors. Approving final manuscript: All authors.
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ADP—Board Membership: UCB, Roche, EchoLight. Payment for lectures: Lilly, UCB, Roche, Gilead. Stocks/stock options: Active Life Sci. XN. Advisory board Amgen, Lilly. Educational talks: Amgen, Lilly, Italfarmaco, FAES. DPA—Department has received research grants from Amgen, UCB. Educational grants: J&J. His research group has received payment for speaker and consultancy services from Amgen and UCB.
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Orduna, G., Mellibovsky, L., Abella, E. et al. Bone tissue quality in patients with monoclonal gammopathy of uncertain significance. J Bone Miner Metab 38, 563–569 (2020). https://doi.org/10.1007/s00774-020-01084-3
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DOI: https://doi.org/10.1007/s00774-020-01084-3