Hi,
Sorry to hear this is what brought you to our site. I have not had a dog with LP but there are several others on here who have dogs or had dogs with LP. My impression is that very few have had their dogs get the tie back procedure but I won't speak for all of them. I just don't want you to go away discouraged until you've heard from some of the members on here, so stick around for a day or so.
I'm so sorry you and Suzy have had to go through this, it sounds very stressful for you both.