Psoriatic arthritis

• Facts:
  RF negative
  Oligoarthritis that can affect DIP joints
  Occurs in 5-30% of psoriasis patients
• History / PE:
  Dactylitis ("sausage-shaped" digits)
  Psoriatic skin changes
• Treatment:
  NSAIDs
  Anti-TNF agents
  Methotrexate
• See Also:
  Seronegative spondyloarthropathy
• Associated With:
  Psoriasis
• Differential Diagnosis:
  Rheumatoid arthritis
  Osteoarthritis