it might be silly saying this, but do get second opinions. When I was facing a full wrist fusion back in 2007( advice from midlands top hand surgeon),as all my wrist bones had shattered ligaments, I insisted he try another path....he performed a partial fusion, with screws and reshaping of my radius...now 6 yrs on its slightly painful at times, but still have 80 % movement.I believe in power of positive thought and going with your heart. In my case I felt the fusion was the cheaper easier option for the surgeon, and not the best for me. The last 6 yrs have been very precious to me, and I hope for maybe another 6 before I lose all my wrist movement.
I too concur with doing the best with what you have, something which the numerous programmes of amputees etc who face an incredibly far steeper issue than mine, always give me encouragement that its worth fighting for what you can .Never give up.In my case I am sure that by constant exercising and strict adherance to physio work helped my wrist recover so well.That and the grace of god and a brilliant surgeon !
All the best for the future btw.