I am being plagued with UTI's (urinary tract infections) and I am concerned because I was told the infection can damage my new knees. I have rarely had UTI's in the past (May be 2 in 15 years) but have been diagnosed with my fourth since May and my sixth since my surgery. I also had one about 2 months before the surgery. My doctor is trying to figure out what is causing the UTI's and how to rid me of them but so far with no luck. He has done multiple cultures but nothing specific has been found. How worried should I be about my new knees?