extensor carpi ulnaris tendon ( RID2382 )
There is negative ulnar variance and a nearly absent dorsal ulnar groove. There is medial dislocation of the ECU, without tendinosis or tenosynovitis. There was no other abnormality on wrist MRI. Apparently there is an association between negative ulnar variance and all sorts of ECU tendon abnormalities, though I only have access to the abstract. [ Article ]
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