Which is the deforming arthrosis of the distal interphalangeal joints?

• A. Heberden arthrosis
• B. Bouchard arthrosis
• C. Psoriatic arthrosis
• D. Spondylarthrosis

Answer: (A)

The main idea is identifying which osteoarthritis pattern affects the distal interphalangeal joints. Heberden arthrosis is the degenerative change seen at the DIP joints, characterized by hard bony enlargements called Heberden nodes from osteophyte formation as cartilage wears down. This DIP involvement is what makes it the classic deforming arthrosis in these joints. In contrast, Bouchard arthrosis affects the proximal interphalangeal joints, psoriatic arthrosis is an inflammatory arthritis often with psoriasis features, and spondylarthrosis refers to spine osteoarthritis. So the DIP-specific deforming arthrosis is Heberden.