@Jayne1 It can take months for that tissue to heal, but there's no way to predict how long it will take for any individual. With my right TKR, it took more than six months for the tight band to disappear; but with my left knee, it happened much sooner. So, not only is every knee different, even two knees in the same person can be different.
You might want to look at this article: Tight Band feeling across the front of my knee
You might want to look at this article: Tight Band feeling across the front of my knee