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01 February 2010

Does serum osteoprotegerin level relate to fragility fracture in elderly women with low vitamin D status?

Grazyna SypniewskaADEFG, Izabela SobanskaBCDEFG, Agnieszka PaterCE, Kornelia Kedziora-KornatowskaBDE, Wieslaw NowackiBDE

Med Sci Monit 2010; 16(2): CR96-101 :: ID: 878360

Abstract

Background
Increased osteoprotegerin (OPG) with elevated bone turnover is supposed to be a homeostatic mechanism limiting bone loss.
Material and Method
Whether osteoprotegerin relates to low-energy fracture in elderly women was investigated by analyzing the relationship between OPG and bone turnover. Sixty-nine women with a first fragility hip fracture participated. The reference group consisted of 23 age-matched women. Serum calcium, 25-OHD3, parathormone, osteocalcin (OC), cross-linked C-terminal telopeptides (CTX-I), tartrate-resistant acid phosphatase (TRAP5b), and osteoprotegerin were assayed immediately post-fracture.
Results
In both groups, median vitamin D and calcium concentrations were in the low reference range, CTX-I were moderately elevated, and TRAP5b activity and parathormone were within the reference range. Significantly lower osteocalcin, a trend to higher OPG, and an inverse correlation between OPG and osteocalcin was found in the fracture group. The distribution of fracture was related to osteocalcin and OPG concentrations: the lower the OC level, the higher the number of women with fracture at increasing OPG concentrations. A relative imbalance between bone formation and resorption was found in the fracture group. The lowest osteocalcin level (Q1) was observed only and vitamin 25-OHD3 insufficiency predominantly in the fracture group and higher OPG, TRAP5b, and elevated CTX-I concentrations (Q3) were found more often or predominantly in this group.
Conclusions
The data demonstrate a relative imbalance between bone formation and resorption associated with fragility fracture in elderly women with low vitamin D status. The authors suggest that compensatory elevation of serum OPG, particularly with reduced bone formation, is insufficient to limit bone loss leading to fracture.

Keywords: Osteoprotegerin - blood, Osteocalcin - blood, Fractures, Bone - blood, Aged, 80 and over, Vitamin D - blood

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