I Have Had Both Knees Replaced In The Past 6

I have had both knees replaced in the past 6 years. One knee is great and the other is giving me problems which I have been going to the chiropractor for. However, I have swelling from mid calf to mid thigh. My leg goes through periods of feeling cool. When I stand up I have intense pain on the upper part of the knee cap area of the joint. I went to an orthopedic Dr. who saw nothing. It was a chiropractor who said my femur was out of place. It feels better after a chiropractic adjustment but is then back to hurting and it is getting worse. Help!!!!