Which of the following conditions is NOT associated with joints?

The choice indicating GERD is the correct answer as it is not associated with joints. Gastroesophageal reflux disease (GERD) is a condition that affects the gastrointestinal tract, specifically the esophagus, and is characterized by the reflux of stomach acids causing heartburn and other digestive issues. Unlike the other options, which are specifically related to joint deformations or osteoarthritis, GERD does not have a direct impact on the musculoskeletal system.

Heberden's nodes and Bouchard's nodes are both associated with osteoarthritis, presenting as bony swellings found in the fingers. Heberden's nodes appear at the distal interphalangeal joints, while Bouchard's nodes occur at the proximal interphalangeal joints, both indicating joint involvement and degenerative changes. Swan neck deformities are also related to joint conditions, particularly rheumatoid arthritis, where the fingers exhibit a specific bending characteristic, affecting the joints' normal alignment. Each of these choices specifically reflects conditions that are linked to joint pathology, making GERD the clear outlier in this context.