Both of my pups have this. Myndi (the Pom) first was diagnosed in just one leg when she was around 3 or 4, and she's almost 16 now. Eventually it flared in the other leg too. She has never had surgery and she gets around fairly well, but she does favor the one leg that is pretty bad, and kind of throws it out to the side when she walks, and doesn't bend it. Sparky's had problems with just one leg for about 4 years now, but it doesn't really bother him a lot and he can still run like the wind and he's almost 13. Neither one has had surgery and it's not an option now due to their age and the fact that they both have heart murmurs too.

Hope your pup manages as well as my 2 have.