Psoriatic arthritis develops in about 20% of patients who have psoriasis.
The clinical manifestations are varied and can change over time, evolving from one articular pattern to another. There is a considerable financial and psychological burden associated with this disease. There has been significant progress recently in understanding the disease pathogenesis, which has translated into new therapies.1
https://www.ncbi.nlm.nih.gov/books/NBK547710/