Not any of mine as I worked with a breed that, though prone to orthopedic issues, isn't prone to knee/stifle problems.
However, I did have a friend who had a dog that went through the surgery: it's a long and painful recovery, and ideally, if available, should include access to a physical therapy facility.
If not, hubs will be doing a lot of gradually the increasing exercise with your little dog.
For my friend, the hardest part of the whole thing was keeping her dog, a medium mixed breed, at rest for the time required immediately after surgery.
I can't imagine having to go through it with-one of my GSDs. The worst orthopedic injury I had with-one of mine was a dislocated hip in an adolescent, working-bred male. Once his hip joint was replaced in position, his leg had to be bound against his body for 6 weeks.
He could still be active in terms of going out in the yard and walks within reason, but he couldn't engage the extreme athleticism that his training and normal exercise routine involved.
I nearly lost my mind, and he wound up on tranks because he DID lose his mind and started self-mutilating. (chewing holes in his forelegs)
I'm sorry for your family and your poor little dog. I hope they heal well. The best thing you can do for them is to get their weight down and keep it down if they are overweight, and to put them on a good joint supplement ASAP, and keep them on that for the rest of their life.
Also, be aware that if they have blown one ACL, they are much more prone to blow the other.