Today, 12th October, is World Arthritis Day.
Gout is the most common inflammatory arthritis. Traditionally, rheumatologists were best known as Gout doctors.
Pathogenically, Gout differs from the other arthritides as an "outside-in" disease process. The immune cells react to the exposed urate crystals deposited around the tendons, entheses and joints, and propagate the inflammation into the joint space, causing an arthritis, and into the cartilage and bone, causing an erosion.
This is somewhat like Psoriatic Arthritis, where the inflammation starts at the enthesitis.