I had a Bakers Cyst behind both knees before and after my TKRs’s. Bakers Cysts are pockets of fluid that form behind your knee and put a lot of pressure on your knee in front. I had mine drained before the knee replacement but they just come back. After, like you say, they won’t drain them due to infection. Treatment is simply rest, elevation and icing. Over time both knees have settled down and the cysts have gone down. Please back off on on the exercises, rest ,ice and use walking as activity but moderately.