I had a total knee replacement done 18 months ago and have progressively had more pain with each month passing. My toes cramp all the time and there is significant pain behind my knee which shoots pain I have been down my leg and into my hip. Do you think The prosthesis might be causing the problem. Am I allergic to it or is it loose? It seems like the rest of my body feels like it’s just shutting down. I’m scared and I need answers because I can’t live like this.