Psoriatic Arthritis is a seronegative spondyloarthropathy caused by the macrophage-induced enzymatic breakdown of bone, tendons, and cartilage. It effects 25% of people suffering from psoriasis. Psoriatic arthritis occurs more commonly in patients with tissue type HLA-B27. Treatment of psoriatic arthritis is similar to that of rheumatoid arthritis. More than 80% of patients with psoriatic arthritis will have [...]