Association of Disease Characteristics with the Temporal Sequence of Skin and Musculoskeletal Disease Onset in Psoriatic Arthritis.

The temporal relationship between the onset of skin psoriasis (Pso) and psoriatic arthritis (PsA) is a long and well-known feature of psoriatic disease. Psoriatic skin lesions emerge years before the development of musculoskeletal manifestations in nearly 75% of PsA patients. While skin and joint manifestations develop within one year in 15-20% of the patients, joint manifestations precede the skin involvement by a year or more in about 10% of the patients (1).