Not DVT....but a good chance it is Claudication....or good old hardening of the arteries. I am getting the ultrasound in a couple days to confirm. If not that.....she thinks it could be arthritis in the knee (doubtful). This is really distressing. 61 years old...active my whole life...and on a healthy diet. GREAT! I can see it now...If I don't drop dead from a heart attack, I'll end up with both legs amputated.