I had cortisone shots in my knees for several years and it was helpful for about 5 years. Then tried PRP which did nothing. Since then have had both knees replaced. One went very smoothly (tho the rehab not fun for about 6 weeks) and the other got infected. Had to have it removed and then redone several months later after infection gone. Good news is that altho that was a difficult time, me knees are great now, can walk all I want. Only complaint is I can’t kneel down. My advise is that if you have any concerns after surgery, insist that you be heard or change doctors.