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Diverging results of areal and volumetric bone mineral density in Down syndrome

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Abstract

Summary

Population with Down syndrome (DS) has lower areal BMD, in association with their smaller skeletal size. However, volumetric BMD and other indices of bone microarchitecture, such as trabecular bone score (TBS) and calcaneal ultrasound (QUS), were normal.

Introduction

Patients with DS have a number of risk factors that could predispose them to osteoporosis. Several studies reported that people with DS also have lower areal bone mineral density, but differences in the skeletal size could bias the analysis.

Methods

Seventy-five patients with DS and 76 controls without intellectual disability were recruited. Controls were matched for age and sex. Bone mineral density (BMD) was measure by Dual-energy X-ray Absorptiometry (DXA), and volumetric bone mineral density (vBMD) was calculated by published formulas. Body composition was also measured by DXA. Microarchitecture was measured by TBS and QUS. Serum 25-hidroxyvitamin D (25OHD), parathyroid hormone (PTH), aminoterminal propeptide of type collagen (P1NP), and C-terminal telopeptide of type I collagen (CTX) were also determined. Physical activity was assessed by the International Physical Activity Questionnaires (IPAQ-short form). To evaluate nutritional intake, we recorded three consecutive days of food.

Results

DS individuals had lower height (151 ± 11 vs. 169 ± 9 cm). BMD was higher in the controls (lumbar spine (LS) 0.903 ± 0.124 g/cm2 in patients and 0.997 ± 0.115 g/cm2 in the controls; femoral neck (FN) 0.761 ± .126 g/cm2 and 0.838 ± 0.115 g/cm2, respectively). vBMD was similar in the DS group (LS 0.244 ± 0.124 g/cm3; FN 0.325 ± .0.073 g/cm3) and the controls (LS 0.255 ± 0.033 g/cm3; FN 0.309 ± 0.043 g/cm3). Microarchitecture measured by QUS was slightly better in DS, and TBS measures were similar in both groups. 25OHD, PTH, and CTX were similar in both groups. P1NP was higher in the DS group. Time spent on exercise was similar in both groups, but intensity was higher in the control group. Population with DS has correct nutrition.

Conclusions

Areal BMD is reduced in DS, but it seems to be related to the smaller body and skeletal size. In fact, the estimated volumetric BMD is similar in patients with DS and in control individuals. Furthermore, people with DS have normal bone microarchitecture.

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Authors and Affiliations

  1. Department of Internal Medicine, University Hospital Marqués de Valdecilla, University of Cantabria, RETICEF, IDIVAL, Santander, Spain

    M. García-Hoyos, M. T. García-Unzueta, C. Valero & J. A. Riancho

  2. Department of Internal Medicine, University Hospital Rio Hortega, Valladolid, Spain

    D. de Luis

Authors
  1. M. García-Hoyos
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  2. M. T. García-Unzueta
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  3. D. de Luis
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  4. C. Valero
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  5. J. A. Riancho
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Correspondence to C. Valero.

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García-Hoyos, M., García-Unzueta, M.T., de Luis, D. et al. Diverging results of areal and volumetric bone mineral density in Down syndrome. Osteoporos Int 28, 965–972 (2017). https://doi.org/10.1007/s00198-016-3814-1

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  • DOI: https://doi.org/10.1007/s00198-016-3814-1

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