History: pain/deformity following trauma
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Does the lunate articulate normally with the distal radius? YES
Does the capitate articulate normally with the lunate? NO
So the lunate is NOT dislocated and this is a :
Notice the stages of carpal dislocation based upon ligament injury/severity. The perilunate is less severe (Stage 3) than a lunate dislocation (Stage 4).
And always look for an associated scaphoid fx.