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Effects of calcium supplements on femoral bone mineral density and vertebral fracture rate in vitamin-D-replete elderly patients

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Abstract

The efficacy of calcium (Ca) in reducing bone loss is debated. In a randomized placebo-controlled double-masked study, we investigated the effects of oral Ca supplements on femoral shaft (FS), femoral neck (FN) and lumbar spine (LS) bone mineral density (BMD), and on the incidence of vertebral fracture in vitamin-D-replete elderly. Ninety-three healthy subjects (72.1±0.6 years) were randomly allocated to three groups receiving 800 mg/day Ca in two different forms or a placebo for 18 months. Sixty-three patients (78.4±1.0 years) with a recent hip fracture were allocated to two groups receiving the two forms of Ca without placebo. FS BMD changes in Ca-supplemented non-fractured women were significantly different from those in the placebo group (+0.6±0.5% v −1.2±0.7%,p<0.05). There was no difference in effect between the two forms of Ca. The changes of +0.7±0.8% v −1.7±1.6% in FN BMD of Ca-supplemented women and the placebo group did not reach statistical significance. In fractured patients, FS, FN and LS BMD changes were −1.3±0.8, +0.3±1.6 and +3.1±1.2% (p<0.05 for the last). The rate of new vertebral fractures was 74.3 and 106.2 fractures per 1000 patient-years in Ca-supplemented non-fractured subjects and in the placebo group, respectively, and 144.0 in Ca-supplemented fractured patients. Thus, oral Ca supplements prevented a femoral BMD decrease and lowered vertebral fracture rate in the elderly.

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Authors and Affiliations

  1. Division of Clinical Pathophysiology (World Health Organization Collaborating Center for Osteoporosis and Bone Disease), University Hospital of Geneva, Geneva, Switzerland

    T. Chevalley, R. Rizzoli MD, V. Nydegger & J. -P. Bonjour

  2. Department of Medicine, Division of Nuclear Medicine, University Hospital of Geneva, Geneva, Switzerland

    D. Slosman

  3. Department of Radiology, Orthopaedic Clinic, Department of Surgery, University Hospital of Geneva, Geneva, Switzerland

    H. Vasey

  4. University Geriatrics Institutions, Geneva, Switzerland

    C. -H. Rapin & J. -P. Michel

Authors
  1. T. Chevalley
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  2. R. Rizzoli MD
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  3. V. Nydegger
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  4. D. Slosman
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  5. C. -H. Rapin
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  6. J. -P. Michel
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  7. H. Vasey
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  8. J. -P. Bonjour
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Chevalley, T., Rizzoli, R., Nydegger, V. et al. Effects of calcium supplements on femoral bone mineral density and vertebral fracture rate in vitamin-D-replete elderly patients. Osteoporosis Int 4, 245–252 (1994). https://doi.org/10.1007/BF01623348

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  • DOI: https://doi.org/10.1007/BF01623348

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