I am sorry to hear about your dog's problem. Good job limiting her exercise.
If she is incapacitated, surgery might be the best option for her. If the tear is partial and she is not a good candidate for surgery, other options are possible for return to normal function (not athlete function). If she is a very active dog, runs, runs, and runs, then surgery is your best option.
Which surgery will depend of her activity level, the surgeon's experience, their preference, presence of arhtirits, and her health.
If she is in good health, she should be good to have surgery. No way we can tell everything will be OK, but veterinarians run a battery of tests before hand to decrease the likelihood of problems during anesthesia. As for recovery, some surgical techniques will get them back on their feet faster then others like a TPLO. Other ones may leave them with more stiffness. I highly recommend physical therapy for your dog after surgery.
Make sure you discuss with the surgeon the activity level for your dog, your money concerns, to make sure you a re presented with the options that reflects your choice.
As for no surgery, the more unstable the knee, if there are some torn meniscus in there, arhtirits will set very fast and could cripple her, and she may not be able to use this leg very well. One important step in surgery is to open the knee joint and clean what is torn and floating around to decrease the amount of irritation.
If this is a partial rupture, and you choose to not go in surgery, you may try physical therapy, adequan injections (produce better joint fluid), acupuncture, continue anti inflammatories, think about stem cell therapy (costly).
Here are some links about cruciate ruptures, physical therapy:
That last one is pretty graphic.
Let me know if you have more questions, or need additional information. If you have a specific question, go ahead, I'm there for you!
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