YES! I tore ACL/MCL in skiing accident and had ACL donor graft February 2014. I worked like crazy in rehab (cause that's what everyone says you have to do, right?) , but weeks later, I was still on crutches and unable to bear weight on that leg. My quads had deteriorated and would not activate after the surgery. My therapist started me on an electrical stimulus unit, which I attached to my quads 4x a day for about 20 minute sessions. My quad function came back slowly, but it eventually came back. I'm over a year post-op now- I still do not (and probably never will) have full extension or flexion of my knee, but I walk fairly well and can pretty much do my everyday activities- though I still have some pain and swelling at the end of the day. Best of luck, my friend.