Rheumatoid Arthritis, Phase Three The pannus releases enzymes, called lysosomes. These enzymes can damage or destroy the surrounding bones. Further Reading: What Is Rheumatoid Arthritis? Related Articles Rheumatoid Arthritis TreatmentRheumatologist for Arthritis TreatmentWhat Is a Rheumatologist?What Is Pannus?Biologics for RA and Other Autoimmune Conditions Related Videos Rheumatoid Arthritis Overview VideoOver 2 million Americans, or 1% of the population, are living with rheumatoid arthritis. Learn the symptoms of this autoimmune disorder and chronic type of inflammatory arthritis.Foot and Ankle Rheumatoid Arthritis VideoView this video to understand how to identify symptoms of foot and ankle rheumatoid arthritis and the treatment options for the pain and swelling.Hand Rheumatoid Arthritis VideoThis peer reviewed rheumatoid arthritis of the hand video outlines the causes and symptoms, as well as treatment options for the pain and inflammation.Shoulder Rheumatoid Arthritis VideoThis video shows the symptoms that can identify rheumatoid arthritis of the shoulder, as well as treatment options for relief from the pain and inflammation.