Authors of section

Authors

Matej Kastelec, Renato Fricker, Fiesky Nuñez, Terry Axelrod

Executive Editor

Chris Colton

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Lunate, dislocation

Complete dislocations of the lunate

In complete dislocations of the lunate, the displacement is usually in a palmar direction. The greater force required to produce this injury is responsible for massive disruption of both the dorsal and palmar ligaments.

Carpus – Complete dislocation of the luante – ORIF – Open reduction internal fixation

Disruption of the dorsal radiolunotriquetral ligament complex

There is also a disruption of the dorsal radiolunotriquetral ligament complex.

Carpus – Complete dislocation of the luante – ORIF – Open reduction internal fixation

“Spilled teacup” sign

The capitate displaces proximally towards the distal radial articular surface. A lateral radiograph shows the “spilled teacup” configuration of the lunate.
On the AP view, the displaced lunate has a triangular profile, rather than its normal quadrilateral image.

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