I AM HAVING A NUCU STRESS IHAVE A SCREW IN

I AM HAVING A NUCU STRESS IHAVE A SCREW IN MY NECK (I TOOK A FALL BROKE MY NECK JUST ABOUT 6 YEARS AGO, THE SCREW DID NOT GO WHERE THE MD DIRECTED TO , HOWEVER, I HAD SURGERY, WORE A HALO
FOR 3 MOS. I WILL BE HAVING TOTAL KNEE REPLACEMENT NOV. 29, THIS MONTH. I HAD MY EKG ALREADY, MY NUMBERS HAVE NOT CHANGED SINCE 2007, AND 2014..I WILL NOT BE WALKING ON TREAD MILL. I AM VERY UPSET ABOUT THIS, WHAT HARM WILL THIS NUC HAVE ON MY BODY. WHAT DO YOU SUGGEST?