What is the characteristic hand radiographic finding for psoriatic arthritis?
Erosion of one end of the bone with expansion of the base of the contiguous phalanx
Periarticular osteopenia and bony erosions predominantly in the phalanges and interphalangeal joints. Characteristic enthesopathy and pencil-in-cup deformity can be seen particularly in the right 4th proximal phalanx.
Further sclerosis and degenerative changes are noted between the scaphoid and trapezoid, and the scaphoid and trapezium.
Incidental note is made of bilateral capitohamate coalition.