Getting back in the boat, sweet. Every so often I consider doing the same thing, but haven’t pulled the trigger. In the meantime, I content myself with regular trips to Row2k.com to monitor the progress of the alma mater toward a third straight IRA title.
So, because it gives me a chance to think and talk about rowing, I am going to chime in with my $.02 on your question.
I looked up some info on deQuervain’s and I have some questions. Do you get pain from movement of the wrist or from gripping? From what I read, and from what you said about the garden tools, it seems like the pain is from gripping. Can you erg without pain? While your concerns seems to be primarily with feathering, I would want to know if yor arm/hand can withstand the drive phase comfortably and allow you to hang from the handle.
If you can erg, I would say you should be able to sweep, at least. However, I think sculling may be overly ambitious. If you were an experienced sculler who only went out in flat water, you would be able to get away with a minimum of stress on your hands and forearms. But as a novice, I would anticipate alot of blade slapping, occasional crabs, and enough general tension and instability that your forearms, wrists, and hands will be under considerable duress while you learn the new skill. This sounds like a recipe for disaster in someone with DT.
But sweep rowing should be fine. Any gripping should only minimally implicate the thumb, if at all. If the up/down movement of the wrist is pain free than you are good to go on port-side, otherwise row starboard.
Whatever you do, I would follow a pretty commonsense pre-, during, and post-row regimen. That is, warm-up the wrist in warm water and on the erg before going out, wear a poggie (or an adapted sock) over the right hand during the row, ice the wrist post-row, and probably splint it at night. That was standard protocol for guys with tendonitis in their wrists when I was rowing.
Finally, Have you exhausted all of your free resources? What I mean is, have you contacted USRowing and MRA to see if they have any advice for you? I would find out who the current docs are for the national team and give them call on the off chance they will give some free advice. And , if teh injections have not solved teh problem, what ahven’t you had the surgical treatment? I hear that is very effective.
Good luck.
Garth