Hi, About a week ago I started to experience a curious pain in the back-right side of my right knee. After 5 years of this TKR working beautifully this has popped up. It hurts (3-5) to extend the knee and stand but I can walk pain free after I get going. I have a ridiculously good range of motion and had started walking on a treadmill to lose some weight. It feels like a pulled muscle yet after a full week of rest nothing has changed. That same area also clicks. When I asked my ortho about it he said noises are not uncommon. I have yet to ask him about this recent pain but will. Anyone else have this?