Coming from someone who has tore his ACL before and done a lot of research into it/is interested in medicine. I'm just here to clear up some things about the "severity" of Rondo's ACL tear
The difference between a partial and full ACL tear is that without surgery, there is more you can do with a partial tear than you can do with a full tear. Basically you still have some stability in the knee with a partial tear. You can still perform with a tear of the ACL, look at Hines Ward and DeJuan Blair, but it involves all of the supporting muscles to pick up their slack which takes a lot of time. Plus, the full potential of recovery without the ACL or a partial ACL is nothing close to what it would be having surgery.
Now if both the individual with the partial tear and full tear were to have surgery, there is no difference. If there is a full tear, the orthopedic surgeon just clears the ACL ligaments floating around/any damaged miniscus and whatnot before grabbing a graft and reconstructing the ACL.
With a partial tear, the surgeon clears out whatever piece of the ACL is floating around. From that point forward from what I understand the orthopedic surgeon removes the remaining ACL as well and just puts in a whole new one in it's place after reconstructing a new one.
As a result, it's the same operation regardless. The surgeon is adding in a whole new ACL. If you had a full tear, they just put a new one in it's place. If it's a partial tear, they remove it anyway and put a full one in it's place
The time of recovery depends on where you got a graft from, you can get one from your patellar tendon (fastest healing time, larger chance of complication {but again these operations have pretty high success rates overall}), hamstring (longer healing time, safer), or from a donor(riskiest)
So in the grand scheme of things, because Rondo got surgery, his position is the same as Derrick Rose's. So expect a 6-12 month recovery time. Personally I think a 12 month window is the safest because overtraining can become an issue with those who tear their ACL's. We don't want a gilbert arenas incident going on.
Also, I expect Rondo to come back with a better jumpshot because without the ability to really jump around and stuff for a while, all you can really do is stand there and shoot the ball. I fully expect his shooting percentage to go up when he comes back