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Number of osteoporotic sites as a modifying factor for bone mineral density

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Abstract

Discordance has been proposed as a new predictor of fracture risk that may affect fracture risk via bone mineral density (BMD). With an emphasis on better understanding the relationship between discordance and BMD, the aim of this study was to determine the effect of the number of osteoporotic sites, as an indicator of discordance, on BMD and to explore the clinical significance of BMD modification by this factor. This study was based on data obtained from the Korea National Health and Nutrition Examination Survey 2008–2011, which is a nationwide cross-sectional study. Among postmenopausal women aged 50 years or older, 3,849 women whose BMD was measured at three sites (lumbar spine, femoral neck, and total hip) were included in the study. The diagnosis was consistent across sites in only 39.2–59.0 % of cases. Lumbar spine T-score was reduced by 0.163 for two osteoporotic sites and by 0.462 for three osteoporotic sites, compared with having one osteoporotic site at the lumbar spine only. Femoral neck T-score was reduced by 0.609 for three osteoporotic sites compared with one or two osteoporotic sites. Using BMD adjusted for discordance, we found fracture risk probability changed significantly. Our results confirmed that BMD discordance was considerably high among Korean women in their 50s and older owing to site-dependent differences in the pattern of BMD reduction with age. Mean BMD decreased with increasing number of osteoporotic sites. Using a modified BMD adjusted for the number of osteoporotic sites may offer more accurate fracture risk assessment.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. School of Business Administration, Hallym University, Hallimdaehak-gil, Chuncheon-si, Gangwon-do, 200-702, Korea

    Jong Seok Lee

  2. Department of Internal Medicine, Chuncheon Sacred Hospital, Hallym University College of Medicine, 77 Sakju-ro, Chuncheon-si, Gangwon-do, 200-704, Korea

    Sungwha Lee, Ohk-Hyun Ryu & Moon-Gi Choi

  3. University of Queensland Medical School, Locked Bag 3333, Bundaberg DC, QLD, 4670, Australia

    Youn Ji Kim

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  1. Jong Seok Lee
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  2. Sungwha Lee
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Correspondence to Sungwha Lee.

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Lee, J.S., Lee, S., Ryu, OH. et al. Number of osteoporotic sites as a modifying factor for bone mineral density. J Bone Miner Metab 33, 684–693 (2015). https://doi.org/10.1007/s00774-014-0635-1

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  • DOI: https://doi.org/10.1007/s00774-014-0635-1

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