My knees hurt all the time. Even the "New Knee". One year ago I had the left knee replaced because it was "frozen up". I had physical therapy and did all exercises as instructed for 6 months. I cannot get any relief except with Tramadol which the doctor says that he does not want me to take much longer. What is the danger of taking Tramadol for a long time? I must get some relief soon because I only take Tramadol when the pain gets unbearable.