I have had cruciate ligament surgery on one of my dogs, but it was an older dog already retired, so a real basic procedure was done with no consideration that the dog return to original function. The dog did fine, it was back when they had to have complete crate rest for a period after the surgery. Now, I think they go right into a rehab program that involves some movement.
I have known of coursing dogs (jackrabbit coursing on natural terrain) return to coursing and do quite well after ACL surgery, so I know some to return to a sporting function (it's quite grueling, involving long distances over rough terrain at extreme speeds).
Good luck! 20 years as a vet tech in the army and I have utmost respect for working K9s, I got to deal with the MWDs a lot.
vickie