Don't sweat it-TONS of yorkies on here have LP. Some have had surgery, usually with the higher grades (3 and 4) and it has gone well. Grades 1 and 2 typically don't need surgery but it's all up to you & your vet. From what I gather, the thing with LP is that in the future, it can turn into arthritis as they get older and THAT is what is painful, not the LP itself. A few supplements will help out the joints and alot of people give Cosequin with great results!
Good luck!