What deformity is associated with rheumatoid arthritis?

Swan neck deformities are closely associated with rheumatoid arthritis due to the disease's impact on the joints and connective tissues. In rheumatoid arthritis, chronic inflammation affects the finger joints, leading to instability and changes in the tendons and ligaments. This results in the characteristic bending of the proximal interphalangeal (PIP) joints and hyperextension of the distal interphalangeal (DIP) joints, creating a swan-like appearance.

The other conditions mentioned are related to different forms of arthritis or joint issues. Heberden's nodes and Bouchard's nodes are specific to osteoarthritis, where bone spurs develop at the joints due to wear and tear. Gouty tophi are associated with gout, a condition that arises from the deposition of uric acid crystals in the joints. Understanding these distinctions is crucial for recognizing the specific deformities that present in various types of arthritis.