Opioid Use among Patients with Early Inflammatory Arthritides Compared to the General Population

Objective. To assess to what extent the worldwide opioid epidemic affects Finnish patients with early inflammatory arthritis (IA). Methods. From the nationwide register maintained by the Social Insurance Institution of Finland, we collected all incident adult patients with newly onset seropositive and seronegative rheumatoid arthritis (RA+ and RA–) and undifferentiated arthritis (UA) between 2010 and 2014. For each case, 3 general population...