Rheumatoid arthritis:
- Soft tissue swelling
- Periarticular osteopenia
- Periarticular erosions
- Diffuse/symmetric joint space narrowing
- Joint subluxations and ankylosis (if advanced)
Peripheral Spondyloarthritis
- Overlapping features with mixed productive and erosive changes.
- Most commonly reactive arthritis and psoriatic arthritis
- Periarticular erosions
- Calcaneal erosions and fluffy periosteal reaction
- Distal IP and MTP involvement
- Ivory phalaynx/anklyosis