Lunate Dislocation



  • Dislocation of the lunate relative to the radius and distal row of metacarpals, most are volar but can be dorsal
  • Usually from high-energy hyperextension with ulnar deviation of the wrist


  • Implies disruption of all 4 perilunate ligaments and radiocarpal ligament (Mayfield classification, stage IV)
  • In volar dislocations, median nerve injury occurs in the carpal tunnel
  • Associated fractures of the radial styloid, scaphoid, capitate, and triquetrum are common and, if present, should raise suspicion of an occult perilunate ligamentous injury

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