It's definitely not a total rupture. It's like the CCL slipped out of place. My vet is a friend and he said if it was his dog, he would wait and do the traditional surgery, which is less invasive. He did say that the ortho recommends the TPLO or TTA (I was a bit in shock when we talked). It's not a total rupture and it happened when he was 4 months old and no limping other than when it happened at 4 months and this weekend. Now, his gait is not normal. You can tell something is wrong, so he needs surgery, but now it's about what and when. He doesn't appear in obvious pain - runs, plays, eats sleeps. I know labs are stoic so I am worried when I see actual limping. The past few months it's just been that he bunny hops if he runs fast and is a bit stiff legged at times, but he does put weight on it. He has no "drawer movement" so that's why my vet felt it was okay to watch and wait until he was 12 months. He wanted to wait until he was closer to full grown so if he did the traditional repair it would not have problems. This is all rather confusing. I want to fix him correctly, but am torn whether an ortho will jump to surgery or a vet doesn't know enough. Right now, I have my vet and his ortho saying different things, essentially. I guess I need a second and third opinion. I can tell though that he is visibly limping again and if he needs surgery now before he is a 1 then it will have to be a TPLO or TTA. *sigh*