X-ray
Lateral
Frontal
- loss of Gilula arcs
- proximal migration of capitate
- capitate not sitting within the distal articular 'cup' of the lunate
- a line drawn through radius and lunate fails to intersect capitate
- lunate is seen displaced and angulated volar (as opposed to perilunate dislocation where it usually remains in articulation with distal radius)
- piece of pie sign: although also seen in perilunate dislocation it may prove very helpful in initial identification of lunate related pathology
- Terry-Thomas sign: increase in the scapholunate space on an AP radiograph of the wrist