Type 2 Diabetes and Fracture Risk in Older Women

2型糖尿病 糖尿病 医学 断裂(地质) 内科学 内分泌学 材料科学 复合材料
作者
Michail Zoulakis,Lisa Johansson,Henrik Litsne,Kristian F. Axelsson,Mattias Lorentzon
出处
期刊:JAMA network open [American Medical Association]
卷期号:7 (8): e2425106-e2425106 被引量:9
标识
DOI:10.1001/jamanetworkopen.2024.25106
摘要

Importance The reasons for the increased fracture risk in type 2 diabetes (T2D) are not fully understood. Objective To determine if poorer skeletal characteristics or worse physical function explain the increased fracture risk in T2D. Design, Setting, and Participants This prospective observational study is based on the population-based Sahlgrenska University Hospital Prospective Evaluation of Risk of Bone Fractures study cohort of older women, performed in the Gothenburg area between March 2013 and May 2016. Follow-up of incident fracture data was completed in March 2023. Data analysis was performed between June and December 2023. Exposures Data were collected from questionnaires and through examination of anthropometrics, physical function, and bone measurements using bone densitometry (dual-energy x-ray absorptiometry), and high-resolution peripheral computed tomography. A subsample underwent bone microindentation to assess bone material strength index (BMSi). Main Outcomes and Measures Baseline assessment of bone characteristics and physical function and radiograph verified incident fractures. Results Of 3008 women aged 75 to 80 years, 294 women with T2D (mean [SD] age, 77.8 [1.7] years) were compared with 2714 women without diabetes (mean [SD] age, 77.8 [1.6] years). Women with T2D had higher bone mineral density (BMD) at all sites (total hip, 4.4% higher; femoral neck (FN), 4.9% higher; and lumbar spine, 5.2% higher) than women without. At the tibia, women with T2D had 7.4% greater cortical area and 1.3% greater density, as well as 8.7% higher trabecular bone volume fraction. There was no difference in BMSi (T2D mean [SD], 78.0 [8.3] vs controls, 78.1 [7.3]). Women with T2D had lower performance on all physical function tests. The study found 9.7% lower grip strength, 9.9% slower gait speed, and 13.9% slower timed up-and-go time than women without diabetes. During a median (IQR) follow-up of 7.3 (4.4-8.4) years, 1071 incident fractures, 853 major osteoporotic fractures (MOF), and 232 hip fractures occurred. In adjusted (for age, body mass index, clinical risk factors, and FN BMD) Cox regression models, T2D was associated with an increased risk of any fracture (HR, 1.26; 95% CI, 1.04-1.54) and MOF (HR, 1.25; 95% CI, 1.00-1.56). Conclusions and Relevance In this cohort study of older women, T2D was associated with higher BMD, better bone microarchitecture, and no different BMSi but poorer physical function, suggesting that poor physical function is the main reason for the increased fracture risk in T2D women.
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