Lunate Dislocation

Lunate Dislocation is a topic covered in the 5-Minute Emergency Consult.

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Basics

Description

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

Etiology

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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Basics

Description

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

Etiology

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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