History: fall, wrist pain
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It’s about the carpal rows!
Answer: SLAC wrist (scapholunate advanced collapse)
In short it’s the end stage of a scapholunate ligament disruption. Scaphoid and lunate separate more and more and the capitate migrates proximally into the gap
more detail on the carpal rows: http://www.radiologyassistant.nl/en/p42a29ec06b9e8/wrist-carpal-instability.html#i43082731f0fe8