Lunate dislocation is an uncommon traumatic wrist injury that requires prompt management and surgical repair. The lunate dislocates by rotating and displacing in the volar direction which results in two cute plain radiograph signs. On an AP film the lunate assumes an abnormal triangular appearance with the apex pointing distally known as the piece of pie sign. The same appearance is also seen in perilunate dislocation. On a lateral film the lunate ‘spills’ forwards creating the spilled teacup sign which is specific for lunate dislocation.
Orthopedics Rotation, coming up! I need to refresh my knowledge on radiography of dislocations, fractures, the works.