Calcified Tissue International

, Volume 63, Issue 5, pp 375–379 | Cite as

Correlation of Serum Osteocalcin Fractions with Bone Mineral Density in Women During the First 10 Years after Menopause

  • M. H. J.  Knapen
  • A. C.  Nieuwenhuijzen Kruseman
  • R. S. M. E.  Wouters
  • C.  Vermeer
Article

Abstract.

Serum immunoreactive osteocalcin (irOC) consists of two fractions that differ from each other by their affinity for hydroxyapatite. The high and low affinity fractions are referred to as irOCbound and irOCfree, respectively. To evaluate whether these fractions are determinants for different characteristics of bone or bone metabolism, we have performed a cross-sectional study among 212 apparently healthy women between 20 and 90 years of age. Bone mineral density (BMD) was determined at the lumbar spine, and the right femur neck, trochanter, and Ward's triangle using dual-energy X-ray absorptiometry (DXA). Biochemical markers for bone formation and resorption were determined in serum and in urine. After classification according to menopausal age, an inverse correlation was found in the 1–10 years postmenopausal women between irOCfree and BMD, notably of the Ward's triangle and femur neck. It is concluded that in 1–10 years postmenopausal women, irOCfree is an independent marker for BMD, but that in other age groups the association is less clear or is absent.

Key words: Vitamin K — Osteoporosis — Bone markers — Gamma carboxyglutamate. 

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Copyright information

© Springer-Verlag New York Inc. 1998

Authors and Affiliations

  • M. H. J.  Knapen
    • 1
  • A. C.  Nieuwenhuijzen Kruseman
    • 2
  • R. S. M. E.  Wouters
    • 2
  • C.  Vermeer
    • 1
  1. 1.Department of Biochemistry, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The NetherlandsNL
  2. 2.Department of Internal Medicine, University of Maastricht, The NetherlandsNL

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