Abnormality of the radioulnar joints Distal radioulnar joint arthritis 2024-12-03T17:26:54Z Arthritis of the distal radioulnar joint Arthritis of the distal radioulnar joint (DRUJ) between the sigmoid notch of the distal radius and the ulnar head can be caused by traumatic, inflammatory, congenital, and degenerative processes. An inflammatory condition of the joint that connects the far ends of the radius and the ulna, known as the distal radioulnar joint (DRUJ). DRUJ arthritis may be characterized by widening of the DRUJ interval, volar/dorsal displacement of the distal ulna, radiographic evidence of osteoarthritis at the DRUJ joint including osteophytes, subchondral cysts, subchrondal sclerosis, and joint space narrowing. DRUJ arthritis