Radiological findings in psoriatic arthritis

The main radiological findings in psoriatic arthritis include:

• erosion of terminal phalangeal tufts (acro-osteolysis)
• whittling of the distal ends of phalanges, metacarpals and metatarsals
• cupping of the proximal ends of phalanges
• cupping with whittling results in the "pencil-in-cup" deformity
• severe destruction of finger and toe joints, particularly distal interphalangeal joints
• ankylosis of finger and toe joints
• sacro-ilitis
• relative lack of osteoporosis compared to rheumatoid arthritis
• telescoping of phalanges in arthritis mutilans