I believe you don't have to worry about surgery unless it's a grade 3 - 4. The best things you can do is watch her weight and keep her from jumping down from high places or going down stairs as much.
Kimchee aggravated her LP while playing fetch in the grass. I think the uneven terrain must have caused her to twist her knee funny. Anyway, she's recovering from her surgery. She was in between grades 3 and 4.
Here's some supplements that I've ordered for Kimchee to help strengthen those week knees! I expect her to have a 40" vertical soon.
Cosequin Regular Strength (180 capsules) MSM250MG120 - MethylSulfonylMethane 250 mg (MSM) 120 C
Ark Naturals Royal Coat Express (8 fl oz)