Does Low Bone Mineral Density Start in Post-Teenage Years in Women With Type 1 Diabetes?

  1. Emily Y. Liu, MD12,
  2. Jean Wactawski-Wende, PHD34,
  3. Richard P. Donahue, PHD4,
  4. Jacek Dmochowski, PHD4,
  5. Kathleen M. Hovey, MS4 and
  6. Teresa Quattrin, MD12
  1. 1The Women and Children’s Hospital of Buffalo, Division of Endocrinology/Diabetes, Buffalo, New York
  2. 2Department of Pediatrics, School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
  3. 3Department of Gynecology-Obstetrics, School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
  4. 4Department of Social and Preventive Medicine, School of Public Health and Health Professions, University at Buffalo, Buffalo, New York
  1. Address correspondence and reprint requests to Teresa Quattrin, MD, Division of Endocrinology, The Women and Children’s Hospital of Buffalo, Kaleida Health, 219 Bryant St., Buffalo, NY 14222. E-mail: tquattrin{at}upa.chob.edu

Abstract

OBJECTIVE—Type 1 diabetes has been associated with decreased bone mineral density (BMD). However, the natural history and etiopathogenesis of osteoporosis in type 1 diabetes are not clear. The aims of this study were to assess BMD in a cohort of young women with type 1 diabetes compared with nondiabetic control subjects and to evaluate the possible association of BMD with diabetes duration, HbA1c, and biomarkers of bone metabolism.

RESEARCH DESIGN AND METHODS—BMD was measured by dual-energy X-ray absortiometry scan in 39 teenage (age 13–19 years) and 33 post-teenage females (age 20–37 years) with type 1 diabetes and 91 female age-matched control subjects. Serum osteocalcin, IGF-I, IGF binding protein-3 (IGFBP-3), HbA1c, and urine N-telopeptides were measured.

RESULTS—After adjustment for age and BMI, BMD values were significantly lower at the femoral neck and lateral spine in women with type 1 diabetes older than age 20 years compared with control subjects but not in the case subjects younger than age 20 years, nor at the anterio-posterior spine, wrist, or whole body. No association was found between BMD and diabetes duration or glycemic control. IGF-I, IGFBP-3, osteocalcin, and N-telopeptides were similar in diabetic subjects and control subjects.

CONCLUSIONS—This study indicates that women with type 1 diabetes exhibit BMD differences early in life with significant differences already present in the post-teenage years. Lower hip BMD in these young women may explain, in part, the higher incidence of hip fracture experienced in postmenopausal women with type 1 diabetes.

Footnotes

  • A table elsewhere in this issue shows conventional and Système International (SI) units and conversion factors for many substances.

    J.W.-W. has received honoraria for speaking engagements from both Merck and Wyeth-Ayerst and is a Principal Investigator or co-Principal Investigator on two subcontracts from other Universities that are funded by Wyeth-Ayerst.

    • Accepted May 1, 2003.
    • Received January 14, 2003.
| Table of Contents