hi, i had new acl put in after tearing it. It has been a few months after the surgery, and the other night i hyper flexed the knee. The knee hurt for about 15 seconds, and then felt fine.I think there is a tiny bit of swelling, but im not sure. My question is if i retore it, would it hurt to walk on? would it swell? and how do i know? I dont want to have to go through that long process again.