I had an osteochondroma on the distal end of the ulna congenitally. After an injury when I was 17, it was removed, leaving a gap between the ulna and the DRUJ. 25 years ago a hand surgeon recommended a Kapandji 'reconstruction' but also said, 'We have 6 different reconstructions for this because we don't know what we're doing.' (Fun fact: he treated Mick Jagger.) I read up on these reconstructions at UCLA's medical library (not the Internet); they often went awry and didn't always improve their patients' arms. I demurred.
The wrist has begun to hurt, occasionally making the hand unusable, apparently in response to long bicycle rides (my favorite pastime). I've thought about surgery again so ask here.
Does your ulna meet your DRUJ? Does the plate repair the ulna? None of the reconstructions offered to me involve a plate, perhaps because the joint is too mobile.