Oh I meant damn in general to flat feet, I have a very flat left foot. Maybe not surprisingly, I also have a very stiff left ankle, and also on long walks etc my left knee gets tired first. Flat feet suck, and I wouldn't be suprised if yours have been a contributing factor to your knee issue. Suprised as well the physio didn't pick up n them and give you some advise on counter them along with your knee stretches etc, or did they?