Psoriatic arthritis (PsA) is an inflammatory type of arthritis that can cause joint pain and stiffness, swollen fingers and toes, nail changes and overall fatigue. Because its symptoms are often similar to other types of arthritis and it rarely progresses the same way in every person, PsA is often difficult to diagnose in its early stages. Its not clear what causes PsA, but it is known that about a third of people with psoriasis-a skin disease that causes a red, scaly rash-will develop the condition. Each year, more than 300,000 patients undergo hip replacement surgery in the U.S. Those who have the procedure typically have much less pain than before surgery, and are able to perform daily activities more easily because the joint moves better. Yet, nearly every orthopaedic procedure will have some impact on a patients ability to safely drive.