The purpose of this study is:||To elucidate the immunomodulating properties of anti-TNF-α therapy in patients with psoriatic arthritis (PsA).|To ascertain whether magnetic resonance imaging (MRI) is a sensitive tool in measuring early response after therapy with anti-TNF-α in the PsA wrist using the Outcome Measures in Rheumatoid Arthritis Clinical Trials (OMERACT) guidelines for rheumatoid arthritis (RA).|To assess whether the lipid and other cardiovascular risk profiles would improve after anti-TNF-α therapy in patients with PsA.