[Early rheumatoid arthritis (ERA) diagnosis].

The rheumatoid arthritis (RA) diagnosis is based on the ARA criteria, even though the radiological joint erosions are often a requirement to make a definite diagnosis. The early rheumatoid arthritis (ERA) concept was thought of following the poor therapeutic response of the established RA. The "window of opportunity" is defined as a time frame in the early phase of the disease in which the therapeutic response is favoured, and thus giving a real chance to modify the course and the prognosis of RA. To achieve such a goal, new imaging modalities have been developed (MRI and Musculoskeletal ultrasonography--MSU), together with new serologic, inflammatory markers, genetic tests and taking into account the environmental impact (such as tobacco smokers). Such an issue can be achieved with a tight collaboration between the primary care physician and the rheumatology speciality care.