Osteoarthritis (OA) is the most common form of arthritis and a major cause of disability in older people. The prevalence of OA increases in the past 20 years(1). However, little has been done into its burden such as comorbidities. Our recent systematic review has found that people with OA are more likely to have other diseases, especially stroke, peptic ulcer, hypertension and depression(2). Whether these comorbidities just co-exist with, share common risk factors with or are causes or consequences of OA remains unknown.
This project aims to examine:
Five work packages (WP) will be performed for these five objectives. Four national registration databases in the UK, Netherlands, Sweden and Spain will be used for WP1-3. Two cohort study databases (the UK Biobank and the Rotterdam study) will be used for WP4. Finally, data from different countries will be meta-analysed (WP5) to examine the consistency between countries and to pool results together as appropriate.
So far, UK and Sweden have been able to produce some results on the comorbidities associated with OA.
Swedish database studied the association with 18 conditions. UK database examined the association with 49 conditions before and after the diagnosis of OA. Besides, the clusters of comorbidities were explored among OA and matched controls using UK database.
Months 0-6: data extraction, cohort development, case/control matching, data cleaning, coding and validation
Months 7-24: complete WP1-3
Months 25-36: complete WP4-5
In Sweden, people with physician-diagnosed knee or hip OA were more likely to develop depression, cardiovascular diseases, back pain, and osteoporosis than people without OA.
In the UK, people with physician diagnosed OA were more likely to develop multimorbidity (≥2 other diseases). The hazard ratio was 1.34, (95% CI 1.82-1.41) between OA and non-OA after adjusting for age, gender, BMI, smoking status and alcohol consumption.
Leading comorbidities were fibromyalgia, rheumatoid arthritis, liver diseases, sleep problems, ankylosing spondylitis, dementia, heart failure, osteoporosis, anaemia, and peripheral vascular diseases. In the OA group five clusters were identified including relatively healthy (18%), ‘cardiovascular/musculoskeletal ’ (12.3%), metabolic syndrome (28.2%), ‘pain and psychological (9.1%), and ‘musculoskeletal’ (32.4%). The non-OA group had similar patterns except that the ‘pain+ psychological’ cluster was replaced by ‘thyroid and psychological’.
S. Swain, C. Coupland, V. Strauss, C. Mallen, C.F. Kuo, A. Sarmanova, S.M.A. Bierma-Zeinstra, M. Englund, D. Prieto-Alhambra, M. Doherty, W. Zhang, Clustering of comorbidities and associated outcomes in people with osteoarthritis - A UK Clinical Practice Research Datalink study, Osteoarthritis and Cartilage, 2022, ISSN 1063-4584
S, Sarmanova A, Coupland C, Doherty M, Zhang W. Comorbidities in Osteoarthritis: A Systematic Review and Meta-Analysis of Observational Studies. Arthritis Care Res (Hoboken). 2020 Jul;72(7):991-1000.
Three patient research partners (PRPs) are involved in the project since we applied for this project. They have actively participated in the meetings and shared their views on the list of conditions to be studied, possible ways of disseminations and the challenges they face because of the comorbidities.