TPLO (Tibial Plateau Leveling Osteotomy) is the best CCL (ACL in a human) surgery for cruciate tears (ruptures), but along with it being the best, it's also the most expensive. Only qualified Vets are allowed to do TPLO's. Regardless of what kind of surgery you go with, you MUST follow rehabilitation recommendations precisely, orhe'll blow it again. ALso you need to know tht the odds are over 20% that the CCL on the other side will rupture within a couple years.

For me to be able to help you out with more advice, I really need for you to answer these questions:
1. Did this happen from a known injury?
2. Was your dog neutered at less than 14 months of age?
3. Does your dog jump in or out of a pickup bed (or similar)that is over 3' high?
4. Do you have your dog on a high quality Glucosamine supplement? (If not, you better do it NOW in order to protect the "good side").