How long does sore quad muscles down front of thigh last? That's pretty much the only issue that's left and it's giving me start up pain around my knee.
I had sore muscles off and on until around 6 or 6.5 weeks. The soreness would move around - sometimes it would be the quad, sometimes the groin, and sometimes even in the back of my upper leg. I'm at 7 weeks now, but about a week ago suddenly my soreness went way down. I still have some residual soreness if I move a certain way, but it's way down.
Having said that, I think this is a highly individual thing. It likely depends on your conditioning before the surgery, how much they need to manipulate you during the surgery, how much swelling you had, and just how each of us is put together. Some people seem to have more soreness early on, and for others it lingers.
Something that may (or may not) have helped me was to gently massage my upper leg. I have some hard plastic things with balls, roughly the size of my thumb, on the end. They are made for massage, and are easily held in the hand. The day before I had my breakthrough day with much reduced pain, I was carefully massaging my leg with these. I'd find a painful spot, and gently push the ball into that spot and move it around slightly. Maybe I was breaking up some scar tissue, or realigning the muscle, or maybe it had no benefit - I don't know - but it might be something to try.