What grade did your vet diagnose your baby as? Uni has grade 3 and I don't plan on getting surgery for her. I have her on glucosamine supplements, and she has not hiked up her leg ever since that first time.
you can read up on it here:
http://www.offa.org/patluxinfo.html
Grade 4 is the worst. Grades 1 and 2 are hardly operated on. Grade 3 is debatable.