OA
- subchondral sclerosis, cysts, joint space narrowing, osteophytes
RA
- generalised osteopaenia
- marginal joint erosions due to synovial proliferation & pannus
- soft tissue swelling
- joint space narrowing
Psoriatic arthropathy
- distal arthritis with affected DIPJs
- periarticular erosions
- affects wrists severely
Gout
- erosions due to tophi
- punched out erosions, periarticular
- overhanging sclerotic margin
- no osteopaenia c.f. to RA