Hello dr, my father is 75 yrs, one years before he has done knee replacement of both knees, after 6 months left knee swollen n very painful, Dr. has given medicine for three months because of infection, it was cured, then after three months same swelling n pain, again medicine, cured now it again started swelling n pain, he is not able to walk, can any one give advice plz, and any homeo medicine is there for treatment, thanks.