I had surgery on my left knee Feb 06 (9 months after I injured it). Don't know what condition you have but I had torn several ligaments and my meniscus (have no idea if I spelt those correctly). Putting off the surgery was the worse thing I could have done. I could not move around and gained about 40 pounds in that time (still have them all). The knee still gets sore if I stress it too much but you will need to have it repaired if you want to work out. I couldn't even walk without my knee brace on.
You should go in and get a complete overhall.....

Very important ...pick a good doctor and follow thru with the therapy.
Good luck
Tony