Clinical Research Directory

Inclusion Criteria: \- Early digital osteoarthritis must combine the clinical AND radiological definition. Clinical definition: At least one of the following 4 criteria: Pain or stiffness or swelling or deformity of a digital joint (IPP and / or IPD) A breach of at least one PPI and / or IPD Age under 60 at the time of the first symptoms Clinical symptoms have been changing for less than 3 years Radiographic definition: The presence of the achievement of at least one PPI and / or IPD. Presence of at least two of the following three criteria: pinching, marginal subchondral condensation, marginal osteophyte Erosion on radiography is not an exclusion criteria \- Consent form signed Exclusion criteria: * patients suffering from rheumatoid arthritis, rheumatoid psoriasis or any other inflammatory rheumatism * patients suffering from metabolic diseasis such as gout, hemochromatosis, Wilson's disease; or from congenital disease such as displasie, osteogenesis, * Presence of advanced radiographic osteoarthritis based in Kellgreen Lawrence score (=4) in one joint among the 10 previous sites. * Not able to provide a sample of blood for any reasons * MRI contraindication * Being in exclusion period determined by another previous study * Subject non affiliated to social insurance * Pregnant or lactating women * Vulnerable people based in L1121-5 article of CSP * Elderly subject or protected subjects disabled to give their consent * Subjects private of freedom by court or administrative order