I am from Long Island too! Roxy and TJ both have LP in both rear legs.
Roxy had surgery in August 2006 - both legs at the same time.
I went to Dr. Laura Hinton at The Center for Specialized Vet. Care in Westbury, NY
http://www.vetspecialist.com/index.p...VC2&number=100
Do a 'search' here on yorkietalk for Luxating Patella - you will find a lot of information.
Here is just one that I just found for you:
http://www.yorkietalk.com/forums/showthread.php?t=67220
You can ask me anything you want - I will try to help you.