Pannus is a type of extra growth in your joints that can cause pain, swelling, and damage to your bones, cartilage, and other tissue. It most often results from rheumatoid arthritis, an inflammatory disease that affects your joints, though other inflammatory diseases are also sometimes to blame.

How does pannus happen?

"Pannus is thought to be a hereditary condition that develops as the pet ages." Predisposing factors such as increased exposure to ultraviolet light, high altitudes, and smoke may contribute to the development of pannus and certainly can exacerbate the condition.

Is there pannus formation in osteoarthritis?

Objective: Pannus in osteoarthritis (OA) has only recently been characterized. Little is known, however, regarding the behavior of OA pannus in vitro compared to rheumatoid arthritis (RA) pannus. The purpose of our study was to compare OA with RA pannus.