A 53 y.o. female complains of pain in her right wrist after a fall. She has mild swelling of her dorsal wrist with tenderness. What's the diagnosis? (scroll down for answer)

Answer:  Scapholunate dislocation

Scapholunate dislocation

• Most common ligamentous injury of the wrist.
• Results from hyperextension of scapholuntae ligament.
• Radiograph reveals a >3mm separation between these two carpal bones - known as the "Terry Thomas sign" 
• Immobilization and referral to orthopedics are appropriate, surgery sometimes required.