Abstract
Background: Immune-mediated inflammatory diseases (IMIDs) are associated with chronic inflammation that may increase fracture risk; however, their impact within specific populations, such as those with type 2 diabetes mellitus (T2DM), remains unclear. This study aimed to evaluate the association between IMIDs and fracture risk, leveraging a large, high-quality population-based cohort of patients with T2DM. Methods: A total of 2,120,900 patients with T2DM without a previous history of fractures were enrolled from the nationwide health check-up database provided by the Korean National Health Insurance Service. The outcomes were overall, osteoporotic, non-osteoporotic, vertebral and hip fractures. Multivariable Cox proportional hazard regression analysis was performed to estimate the adjusted hazard ratios (aHRs) with 95% confidence intervals (CIs) according to the presence of IMIDs. Results: The presence of ulcerative colitis (aHR: 1.31), rheumatoid arthritis (aHR: 1.19), ankylosing spondylitis (aHR: 1.32), and psoriasis (aHR: 1.14) were significantly associated with the risk of overall fractures. Compared with controls, patients with a single IMID (aHR: 1.18) and at least two IMIDs (aHR: 1.29) had a significantly increased risk of overall fractures, showing a dose-response relationship. Similar results were observed for osteoporotic, vertebral, and hip fractures. Conclusions: The presence of IMIDs in patients with T2DM was associated with an increased risk of fractures, particularly osteoporotic, vertebral, and hip fractures. This study highlights the significant impact of IMIDs on fracture risk within a diabetic population, emphasizing the need for careful monitoring and tailored management strategies.