Qi have both knee joints bob on bone. The rat one the worst.iam currently on the beginning of my second round of Symbian and have no pain. Dr.s have insisted I have a full titanium knee replacement. I have seen the replacement and heard they come different sizes for both men and women. Knowing that what is your opinion on how I should move forward? Jacqueline mitchell age 72 , 5'5" tall 150 #?