Gout [top]

  • Acute monoarthritis
  • Most commonly affecting big toe, but large joints also involved knee pain
  • Associated gouty tophi, previous history of gout
  • Elevated serum urate

Reiter's syndrome [top]

  • Reactive arthritis manifesting asMonoarthritis or polyarthritis, urethritis, conjunctivitis
  • Preceding sexually transmitted infection (neisseria, chlamydia or intestinal infection (salmonela, shigella, campylobacter
  • Associated with circinate balanatis, keratoderma blennorrhagicum

Rheumatoid arthritis [top]

  • Symmetrical deforming polyarthritis polyarthritis or monoarthritis Hand pain or deformity
  • Involvement of small joints of hands, wrists, knees knee pain
  • Morning stiffness
  • Can lead to severe deformities including swan-neck and boutonniere deformities
  • Usually RF+ve

Haemarthrosis [top]

  • Monoarthritis following trauma

Psoriatic arthritis [top]

  • May have other clinical features of psoriasis including nail pitting. Usually RF-ve.
  • Assymetric: Monoarthritis or oligoarthritis
  • Symmetrical deforming polyarthritis polyarthritis particularly distal interphalangeal joints hand pain or deformity
  • Rheumatoid-arthritis like
  • Arthritis mutilans
  • Ankylosing spondylitis-like

Septic arthritis [top]

  • Acute Monoarthritis, severe pain, swelling knee pain ankle pain
  • Fever, elevated inflammatory markers
  • Inability to weight bear

Pseudogout [top]

  • Acute monoarthritis
  • Most commonly knee knee arthritis
  • Risk factors: elderly, hyperparathyroidism, hypothyroidism, osteoarthritis, haemochromatosis

Leukaemic joint deposits [top]

  • Monoarthritis
  • Either known leukaemia or diagnostic features on blood film or bone marrow