Temporal relationship between osteoarthritis and comorbidities: a combined case control and cohort study in the UK primary care setting

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Objective

To determine the burden of comorbidities in osteoarthritis (OA) and their temporal relationships in the UK.

Methods

The Clinical Practice Research Datalink (CPRD) GOLD was used to identify people with incident OA and age, gender and practice matched non-OA controls from UK primary care. Controls were assigned the same index date as matched cases (date of OA diagnosis). Associations between OA and 49 individual comorbidities and multimorbidity (≥2 comorbidities excluding OA) both before and after OA diagnosis were estimated, adjusting for covariates, using odds ratios (aOR) and hazard ratios (aHR) respectively.

Results

During 1997–2017, we identified 221 807 incident OA cases and 221 807 matched controls. Of 49 comorbidities examined, 38 were associated with OA both prior to, and following, the diagnosis of OA, and 2 (dementia and SLE) were associated with OA only following the diagnosis of OA. People with OA had higher risk of developing heart failure (aHR 1.63; 95% CI 1.56–1.71), dementia (aHR 1.62; 95% CI 1.56–1.68), liver diseases (aHR 1.51; 95% CI 1.37–1.67), irritable bowel syndrome (aHR 1.51; 95% CI 1.45–1.58), gastrointestinal bleeding (aHR 1.49; 95% CI 1.39–1.59), 10 musculoskeletal conditions and 25 other conditions following OA diagnosis. The aOR for multimorbidity prior to the index date was 1.71 (95% CI 1.69–1.74), whereas the aHR for multimorbidity after the index date was 1.29 (95% CI 1.28–1.30).

Conclusions

People with OA are more likely to have other chronic conditions both before and after the OA diagnosis. Further study on shared aetiology and causality of these associations is needed.



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