I had my left knee replaced four years ago.  In the last year I am having problems...pain pain.  I finally told my ortho the other day and they did a bone scan.  Have not talked to him about the results yet.  I knew the guy doing the scan and he told me there was "increased blood flow" on the knee...I am so frustrated and hope there is something that can be done to fix it.  My right knee is already half way to being replaced as well.  Any advice or has anyone been down this road.  Thanks...Moja :)