I would like to get knee and thigh liposuction before my knee replacement. Is this possible in my situation?

Thanks for the question as long as you have about 6 months in between you should not have any issues with infection, when putting in foreign bodies to the body like a knee implant its important to set yourself up for success. For knee and all lower extremity liposuction make sure you see someone who is very experience. You need specific instruments and the knowledge that in the leg the fat that needs removal is at different depth in different areas to ensure smooth results, for instance if too much superficial fat is removed it can destabilize an area and cause skin to sag

There is no reason why you should not have liposuction of knees and thighs before knee replacement. In person consultation with a board certified plastic surgeon with good reputation in liposuction would to further clarify your options. Good luck.

Certainly you can have liposuction of your legs including thighs, knees, and even lower legs, prior to any orthopedic procedure.  I would recommend doing it well in advance and communicating both with your plastic and orthopedic surgeon regarding timing.