Not quite the same, but when Ruger was about 4 years old we were both crawling over a big blowdown. As he jumped both hind feet caught and he was dangling from them, completely off the ground. If I hadn't been right there he'd have died where he hung. He completely ruined both knees and could barely walk
I got prices of $6-8000 per knee. I loved my dog, but not that much. My regular vet felt he could do the same for less. I told him that he just needed to be pain free; Ruger could stay home and be a couch potato. It took a while, but by the next spring he was going in the woods with me again. My favorite picture was of him standing in a stream the next summer, a mile from the truck. It was a big milestone of his recovery. The only thing he couldn't do was jump. That was rather convenient as I could put him in the back of the truck and go into the store at the end of a hot summer day, and not worry about him jumping out.