Both of mine have kneecaps that pop in and out. Grade 2 to 3. I would try the fish oil first if she's not having issue much now. Mine don't even hike their legs. Uni only did it once and that's why I found out about it after I took her to the vet to get it checked out.
Also get a second opinion from another surgeon. Some are surgery happy to get your money.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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