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Abstract
Older women with type 2 diabetes mellitus (DM) have higher bone mineral density (BMD) but also have higher rates of fracture compared to those without DM. Limited evidence suggests that DM may also be associated with more rapid bone loss. To determine if bone loss rates differ by DM status in older women, we analyzed BMD data in the Study of Osteoporotic Fractures (SOF) between 1986 and 1998. SOF participants were women ≥65 years at baseline who were recruited from four regions in the U.S. DM was ascertained by self-report. BMD was measured with dual-energy x-ray absorptiometry (DXA) at baseline and at least one follow-up visit at the hip (N = 6624) and calcaneus (N = 6700) and, on a subset of women, at the spine (N = 396) and distal radius (N = 306). Annualized percent change in BMD was compared by DM status, using random effects models. Of 6,867 women with at least one follow-up DXA scan, 409 had DM at baseline. Mean age was 70.8 (SD 4.7) years. Baseline BMD was higher in women with DM at all measured sites. In models adjusted for age and clinic, women with prevalent DM lost bone more rapidly than those without DM at the femoral neck (−0.96 vs. −0.59%/year, p < 0.001), total hip (−0.98 vs. −0.70%/year, p < 0.001), calcaneus (−1.64 vs. −1.40%/year, p = 0.005), and spine (−0.33 vs. +0.33%/year, p = 0.033), but not at the distal radius (−0.97 vs. −0.90%/year, p = 0.91). These findings suggest that despite higher baseline BMD, older women with DM experience more rapid bone loss than those without DM at the hip, spine, and calcaneus, but not the radius. Higher rates of bone loss may partially explain higher fracture rates in older women with DM.
Highlights
Type 2 diabetes mellitus (DM) and osteoporosis are two chronic conditions whose prevalence and associated costs continue to increase, among the elderly
We studied the associations between diabetes and rate of bone loss at several skeletal sites in older women enrolled in the Study of Osteoporotic Fractures (SOF), using longitudinal data from 1986 to 1998
Women with prevalent DM had lower grip strength, slower walking speed, and were less likely to walk for exercise and to report estrogen use
Summary
Type 2 diabetes mellitus (DM) and osteoporosis are two chronic conditions whose prevalence and associated costs continue to increase, among the elderly. Considerable overlap in DM and osteoporosis would be expected due to the high prevalence of each condition. DM is associated with increased risk of fracture (Janghorbani et al, 2007; Vestergaard, 2007). Cross-sectional studies have demonstrated that DM is associated with normal or higher bone mineral density (BMD) (Buysschaert et al, 1992; Bauer et al, 1993; Orwoll et al, 1996; Vestergaard, 2007). For any given BMD T -score, the fracture risk in those with DM tends to be higher than the corresponding risk for non-diabetic patients (Schwartz et al, 2011)
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