u/Embarrassed-Green-62

I am 6 weeks post op and my PT wants me to do leg extensions. They are extremely painful on my knee and the only way I can get my leg up is to tap the muscles. I ask AI and it says it is too early to do full extension as it puts a lot of strain on my graft and right now it is at its most fragile. In PT, should I push through the pain or refuse to do this exercise for now?