Joints form where one bone connects to another bone, allowing the skeleton to move. While there are several different types of joints that differ in structure and the way they move, hinge joints are ...

The disease may begin in childhood. Psoriatic arthritis, or PsA, is a chronic, autoimmune form of arthritis that causes joint inflammation and occurs with the skin condition psoriasis. It can affect ...

What is juvenile idiopathic arthritis? Juvenile idiopathic arthritis (JIA) is a form of arthritis in children. Arthritis causes joint swelling (inflammation) and joint stiffness. JIA is arthritis that ...