To further assess the safety and effectiveness of adalimumab 40mg in the treatment PsA who have had an unsatisfactory response or intolerance to prior or ongoing DMARDs

Inclusion Criteria:

• Active psoriatic arthritis defined by >= 3 tender or painful joints and >= 3 swollen joints despite standard psoriatic arthritis therapy
• Has had an unsatisfactory response or intolerance to at least two prior or ongoing DMARDs (one of which has to be methotrexate)

Exclusion Criteria:

• Has a history of cancer or other than certain skin or cervical cancers
• Has a history of, or current acute inflammatory joint disease of origin other than PsA, e.g., systemic lupus erythematosus etc.
• Has other, unstable diseases, including congestive heart failure, inflammatory bowel disease, recent stroke, leg ulcers or other condition which would put the subject at risk
• History of active tuberculosis, history of histoplasmosis or listeriosis
• Latent TB or risk factors for the activation of latent TB, e.g. previous exposure to TB, and has not initiated TB prophylaxis prior to the first adalimumab treatment