A 60-year-old sculptor comes to the office for treatment of…

A 60-year-old sculptor comes to the office for treatment of pain in his fingers. He has a history of arthritis. On physical examination of the hands, he has nodules on the dorsolateral aspect of his proximal (PIP) & distal interphalangeal (DIP) joints R>L. These nodules are hard and painless. Based on this information, what type of arthritis does this patient have?