A feature of rheumatoid arthritis that differentiates it from other forms of inflammatory arthritis ...

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Pannus is a feature of rheumatoid arthritis that differentiates it from other forms of inflammatory arthritis. Pannus, destructive vascular granulation tissue, extends from the synovium to involve the unprotected bone at the junction between cartilage and subchondral bone. Systemic lupus erythematosus (SLE) is characterized by the formation of autoantibodies and immune complexes. RA and SLE are characterized by subluxation of the carpometacarpal joint and other joints. With acute gouty arthritis, there are recurrent attacks of severe articular and periarticular inflammation, resulting in tophus formation (accumulation of crystalline deposits) in articular surfaces, bones, soft tissue, and cartilage.

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