[Do we need imaging techniques for the diagnosis of rheumatoid arthritis in 2011? The value of imaging in the new ACR/EULAR classification criteria for rheumatoid arthritis].

The modified significance of radiological criterion in the new ACR/EULAR classification criteria for rheumatoid arthritis is based on the fact that the bone erosion seen using conventional radiology is the result of an already longstanding inflammatory process.In contrast, new imaging modalities such as magnetic resonance imaging (MRI) and ultrasound are able to visualize the typical features of active joint inflammation. However, according to the new criteria, the use of MRI and ultrasound is additional or complementary to confirm clinical findings, and does not represent a criterion in itself.