Lunotriquetral ligament instability

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Background

  • Ulnar equivalent of the scapholunate ligament injury
  • May be confused with other causes of ulnar-sided wrist pain
  • Results from FOOSH with impact on hypothenar eminence

Clinical Features

  • Localized tenderness on ulnar aspect of wrist just distal to ulna

Differential Diagnosis

Hand and finger injuries

Evaluation

  • X-ray (note: imaging is often normal with this injury)
    • PA - Widening of the triquetrolunate joint space
    • Lateral - volar intercalated segment instability is seen
      • Lunate tilts palmar producing zigzag pattern (opposite of scapholunate injury)

Management

  • Ulnar gutter splint or short arm posterior mold
  • Refer to orthopedic surgery

Disposition

  • Discharge with ortho follow-up

See Also

References