Hi there

I'm sorry to hear Bonnie has a bad elbow.
Elbow dysplasia is a term that covers several different problems with the elbow. From what I can gather
ulnar osteotomy is a procedure that is used when fixing UAP.
UAP (ununited anconeal process) is the type of dysplasia Buster has, it's where the nobbly bit at the back of the elbow (anconeal process) is loose, this bit can be fixed back into place but also it appears that another opperation can be done on the ulna.
Buster also had turned out feet, caused form one bone growing faster than the other the vet said they could opperate by cutting a part of one bone out to even up the leg. I declined. The bones caught up with each other a bit, his feet are not perfect but they are good enough for him to lollop around on and cause him no problems

If I have got this right and the term your vet uses is a
treatment for UAP (or even turned out feet), please think really hard before deciding on an opperation.
I discussed in depth with the vet what the options were for the future if we didn't have the op (the specialist recomened we try to mange things without the op to start with anyway). Basically, there was no guarantee that the op would give Buster limp-free movement (he get the occasional limp, or it shows if he is running), also even if the anconeal process rubbed on the elbow causing bony changes, it would still be possible in the future to have it fixed back in place as the bones can be 'cleaned up' - this is completely different to the things you read on the 'net! If any future op was to fail or his elbow be too bad to opperate on then an elbow replacement can be done.
Carefully builling up his walks has done exactly what the vet said - build up the muscles which support the joint

This was done VERY gradually, to start with we wouldn't get more than about 10 yards in 5 minutes (he really had problems walking so I was not to push him).
Buster will be 3 years old this summer, there is still NO op on the horizen

. He's doing great, in fact he's doing so well I've extended his walks again. His walk was taikng 45 minutes (brisk pace), but he has started to run around it in places, now it's done in 20mins, so we now also visit a huge open field where he can have a 20 min game of chase with me!!! (he does stay on his 32ft long-line). Wow - this is a pup that I sometimes had to help get up from being laid down - unbelieveable progress
I think you need to have a word with your vet and find out exactly what is wrong with the elbow and all the options they see as being available (there is always more than 1 option

).
If Bonnie has the same problems has Buster (UAP, turned out feet) then you can see Buster has done brill without the opperations.
Oh, I nearly forgot, here is a link to Elbow Dysplasia expaining more about it.
http://www.liv.ac.uk/sath/conditions/elbow_displasia.htm