Hello, my mother had a knee replacement in 2001. 2015 she got an infection in her knee. she had antibiotic spacers put in and was treated with iv antibiotics. When she was feeling better they replaced the knee. After several surgeries and iv antibiotics. A year later almost to the day she was back in the hospital with the same symptoms. They again cleaned the area and put in antibiotic spacers back in. Well they finally had to send the specimens to a special lab because every test came back normal. Well finally the test showed pneumonia. My question is how did she get pneumonia in her knee and would that have caused all of this to happen?