 [ Symptoms ] what kinds of infections may occur in tkr 13 mons ago knee aspirations been bloody for past 5 months serious cure  orthopedic surgeon thinks i have an infection but lab test always negative he also thinks i may be allergic to the metal he wants to perform another replacement but i think we should do something first to determine why as much as 25cc of blood comes out every 5 6 wks when i have my knee aspirated please help me i am very worried that the toxins are doing damage to my leg i have had ct scan mri & a nuclear bone scan dr admitted he is not certain what to do maybe use ceramic [ Disease ] i am sorry about what you are going through you must feel very worried a forum like this is not the best place to get answers to your questions you need to rely on medical professionals infection is a potential complication of any joint replacement surgery it sounds like your surgeon is doing everything possible to determine if your joint is infected or not at this point it sounds like it is not the majority of orthopedic surgeons have dealt with the issue of post surgical infection if you are not satisfied with the answers you are getting from your surgeon tell him you want to be referred to someone else for a second opinion or perhaps he could refer you to an infectious disease specialist for a work up again i am sorry to hear you are dealing with these worrisome symptoms i hope everything gets resolved for you soon wishing you well