Total Knee Replacement Performed 5 Years Ago. Cement Had Come Undo Have To Have Another Tkr. I Need Advice?

In my 40’s, after 4 surgeries and lot’s of knee pain my DR (after many DR opinions) a Total Knee Replacement was performed nearly 5 years ago. Last year I began experiencing bad pain in same knee. DR took xray and said the cement that held the knee replacement together was gone, it had dislodged. Occasionally with people in my age group this apparently can happen. It is taken 100’s of phone calls (I have excellent coverage but insurance companies suck). This is through State Farm because I was hit head on (their fault) that the DR said caused the deteriation of the knee. I even have an Attorney. My knee hurts so bad I can barely walk and can not work. Any suggestions?