JOURNAL ARTICLE
OBSERVATIONAL STUDY
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The prevalence of radiological glenohumeral osteoarthritis in long-term type 1 diabetes: the Dialong shoulder study.

OBJECTIVES: This study compares the prevalence of radiological osteoarthritis (OA) in patients with type 1 diabetes mellitus (DM1) for > 45 years and controls, and explores the association with shoulder pain and glycaemic burden in patients with DM1.

METHOD: The Dialong study is a cross-sectional, observational study with 30 years of historical data on long-term glycaemic control. We included 102 patients with DM1 and 73 diabetes-free controls. Demographic data, worst shoulder pain last week [numeric rating scale (NRS) 0-10], pain on abduction at examination (NRS 0-10), and current and historical glycosylated haemoglobin (HbA1c ) levels were collected. Standardized shoulder X-rays were taken and interpreted for OA applying the Kellgren-Lawrence classification.

RESULTS: In the diabetes group (49% women), the mean ± sd duration of DM1 was 50.6 ± 4.8 years, mean 30 year HbA1c 7.4%, and age 61.9 ± 7.1 years. The mean age of controls (57% women) was 62.6 ± 7.0 years. Radiological glenohumeral OA was found in 36 diabetes patients (35%) and 10 controls (14%) [odds ratio (OR) 3.4, 95% confidence interval (CI) 1.6 to 7.5; p = 0.002]. Few persons had moderate and severe OA [6.9% vs 1.3%, OR 5.3 (95% Cl 0.6 to 44.1); p = 0.1]. Fifteen diabetes patients had painful OA versus two controls (adjusted OR 5.4, 95% CI 0.6 to 47.9; p = 0.13). There was no association between OA and long-term glycaemic burden (mean 30 year HbA1c ) in the diabetes group (p > 0.2).

CONCLUSIONS: Radiological glenohumeral OA was more common in patients with DM1 than in controls for mild, but not moderate and severe OA. The radiological findings were not associated with shoulder pain or long-term glycaemic burden.

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