Joint involvements in diseases


  • MC joint involved-Knee Joint
  • Primary OA(idiopathic)
  • Secondary OA(Trauma,metabolic etc)
  • Joint mice,subchondral sclerosis,osteophyte formation,Joint space narrowing
  • Heberdens nodes and Bouchards nodes.
  • Bouchards——->PIP
  • Heberdens——>DIP
  • Mnemonic:bOuchards—>O for Osteoarthritis
  • B Comes before H so B for PIP and H for DIP

Rheumatoid arthritis

  • HLA DR4 association
  • MC in women
  • Synovial hypertrophy and granulation tissue formation over cartilage(Pannus)
  • Symmetrical small Joint pains
  • MCP and PIP involvement
  • DIP never involved
  • Swan neck deformity-Flexion at DIP and hyperextended PIP
  • Boutonniere deformity-Flexed PIP
  • Atlantoaxial subluxation

Psoriatic Arthritis

  • DIP involvement
  • Sausage digits
  • Pencil in cup appearance


  • MC in MEN
  • Assymetric joint involvement
  • Joint swollen,red,painful.
  • Painful MTP joint of big toe-podagra
  • Due to precipitation of monosodium urate crystals due to hyperuricemia.
  • Gouty tophus
  • Needle shaped negatively birefringent crystals


  • Calcium pyrophosphate crystals
  • Basophilic rhomboid crystals
  • Weakly positive birefringent
  • Affects large joints,classically knee
  1. i think u have written wrong in swan neck deformity

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