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High Bone Mineral Density and Fracture Risk in Type 2 Diabetes as Skeletal Complications of Inadequate Glucose Control

The Rotterdam Study

  1. Fernando Rivadeneira, MD, PHD1,2,3
  1. 1Department of Internal Medicine, Erasmus Medical Center, Rotterdam, the Netherlands
  2. 2Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands
  3. 3Netherlands Consortium for Healthy Ageing, Netherlands Genomics Initiative, The Hague, the Netherlands
  4. 4Department of Ophthalmology, Erasmus Medical Center, Rotterdam, the Netherlands
  5. 5Department of Radiology, Erasmus Medical Center, Rotterdam, the Netherlands
  1. Corresponding author: Fernando Rivadeneira, f.rivadeneira{at}erasmusmc.nl.

Abstract

OBJECTIVE Individuals with type 2 diabetes have increased fracture risk despite higher bone mineral density (BMD). Our aim was to examine the influence of glucose control on skeletal complications.

RESEARCH DESIGN AND METHODS Data of 4,135 participants of the Rotterdam Study, a prospective population-based cohort, were available (mean follow-up 12.2 years). At baseline, 420 participants with type 2 diabetes were classified by glucose control (according to HbA1c calculated from fructosamine), resulting in three comparison groups: adequately controlled diabetes (ACD; n = 203; HbA1c <7.5%), inadequately controlled diabetes (ICD; n = 217; HbA1c ≥7.5%), and no diabetes (n = 3,715). Models adjusted for sex, age, height, and weight (and femoral neck BMD) were used to test for differences in bone parameters and fracture risk (hazard ratio [HR] [95% CI]).

RESULTS The ICD group had 1.1–5.6% higher BMD, 4.6–5.6% thicker cortices, and −1.2 to −1.8% narrower femoral necks than ACD and ND, respectively. Participants with ICD had 47–62% higher fracture risk than individuals without diabetes (HR 1.47 [1.12–1.92]) and ACD (1.62 [1.09–2.40]), whereas those with ACD had a risk similar to those without diabetes (0.91 [0.67–1.23]).

CONCLUSIONS Poor glycemic control in type 2 diabetes is associated with fracture risk, high BMD, and thicker femoral cortices in narrower bones. We postulate that fragility in apparently “strong” bones in ICD can result from microcrack accumulation and/or cortical porosity, reflecting impaired bone repair.

  • Received June 20, 2012.
  • Accepted December 3, 2012.

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0/ for details.

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This Article

  1. Diabetes Care vol. 36 no. 6 1619-1628
  1. All Versions of this Article:
    1. dc12-1188v1
    2. 36/6/1619 most recent