The xray you provided shows that your brother had a fusion between the distal ulna and the radius, as well as creation of a more proximal ulnar pseudarthrosis to provide forearm rotation. This is called the "Suave Kapanji" procedure.
Ordinarily this is one of several options for treating DRUJ (distal radioulnar joint) arthritis. But, as in your brother's case, it can be used to treat ulnar impaction syndrome--so long as the length of the ulna is shortened prior to performing the fusion. The "gap" in the ulna is intentional--to allow for forearm rotation.
I have attached 2 pictures which may be easier to see for future Forum viewers.
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