Which joint deformity is characteristic of Rheumatoid Arthritis?

The characteristic joint deformity associated with Rheumatoid Arthritis is the Swan Neck Deformity. This deformity typically occurs as the result of damage to the ligaments and tendons that stabilize the fingers, particularly affecting the proximal interphalangeal (PIP) joints. In Swan Neck Deformity, there is hyperextension at the PIP joint accompanied by flexion at the distal interphalangeal (DIP) joint, forming a distinctive shape resembling a swan's neck.

The presence of Swan Neck Deformity is significant in clinical assessments of patients with Rheumatoid Arthritis, as it reflects the underlying autoimmune mechanisms that lead to joint damage and alterations in finger positioning. Identifying this deformity can aid in monitoring disease progression and evaluating the effectiveness of therapeutic interventions.