Following x ray wrist lateral view shows:

Ref. Grainger and Allison's Diagnostic Radiology. Page. 502   Perilunate dislocation (X ray) AP radiograph  Dislocation is often overlooked Disruption of the normally smooth line made by tracing the proximal articular surfaces of the hamate and capitate Increased overlap of lunate and capitate Lateral radiograph Dislocation more easily appreciable Capitate not sitting within the distal articular 'cup' of the lunate Line drawn through radius and lunate fails to intersect capitate  Lunate remains in articulation with distal radius (as opposed to lunate dislocation where it is usually in a volar position) Abnormal scapholunate angle (normal 30-60 degrees, reduced in dorsal perilunate dislocation) Abnormal capitolunate angle (normal 0-30 degrees, increased in dorsal perilunate dislocation)