Erosive hand osteoarthritis

Radiograph of the left hand demonstrating features consistent with erosive osteoarthritis (OA) of the hand. There is a central subchondral erosion and pseudo-widening at the proximal interphalangeal (PIP) joint of the fourth finger, and bony proliferation at the diaphysis. The distal interphalangeal (DIP) joint of the fifth finger has a central erosion. The DIPs of the fifth and index fingers also show subluxation, disorganization, and radial deviation. There is marked narrowing and subluxation of the first carpometacarpal (CMC) joint, which is sometimes a key feature of erosive hand OA.