This book provides a detailed investigation of psoriatic arthritis (PsA), a chronic rheumatic disease that involves joints, entheses and skin. Although PsA has been considered as a milder form of arthritis, in the past decade, it has been proven to be a potentially serious disease like rheumatoid arthritis (RA). Radiographic findings, clinical presentation and laboratory tests reveal that PsA is a distinct joint disorder from RA. However, early diagnosis of PsA is difficult. The book illustrates how to accurately diagnose the disease through a systematic approach to PsA. It presents typical and important case studies, alongside rarer and interesting examples. It will be of interest to rheumatologists, dermatologists, orthopedists, radiologist, physiatrists, pediatricians, general physicians, and patients and their families.