Abstract
Clinical remission has become an achievable target for the majority of patients with rheumatoid arthritis, but subclinical inflammation as assessed by ultrasound and magnetic resonance imaging (MRI) has been demonstrated to be frequent in patients in clinical remission. Subclinical synovitis has been shown to be linked to both subsequent structural damage progression and a risk of flare, demonstrating that subclinical synovitis represents incomplete suppression of inflammation and questions whether it is appropriate only to use clinical composite scores as treatment target in clinical practice. Maintaining a state of remission has proven important as sustained clinical remission impacts long-term outcome regarding joint damage progression, physical function and quality of life. Treating subclinical inflammation has been attempted and has led to more frequent strict clinical remission and better physical function, but also to more adverse events. Thus, an overall benefit of incorporating imaging goals in treat-to-target strategies has not been documented. However, in patients in clinical remission on biological disease-modifying anti-rheumatic drugs, both ultrasound and MRI may aid in the clinical decision regarding whether drug tapering or even discontinuation should be attempted.