went to 4th doctor today for second opinion, actually 4th opinion, and he aspirated my knee, it was a lot of blood! It is now in for tests. This is 13 months after total stryker knee replacement. I kept telling these docs that the knee felt like an elephant I was having to drag around and the problems I was having with it, but was constantly rebuffed as if it was all in my head. I don't get it! Also may have slight loosening of implant?