Knee buckling 3 years out from total knee replacement. I'm checking this out with a knee orthopedist the end of the week but wondering if anyone else has been dealing with a similar experience. Back in April my same thigh was hurting and the ortho sent me for PT but it resulted in too much pain so I stopped. At this time, I think I need more than a simple xray and am requesting add'l imaging. Not sure if I can get an MRI since there's metal in the knee replacement.