Sorry to hear about your set back, but I agree with the others, let the ankle heel and pick up working if you feel the need later on, on your knee. I had to quit p/t abruptly and I can't say it really hurt anything, if anything I think I should have cut back or quit sooner and my knee may have done some if not all of it's healing on it's own. I think the 3x's a wk of p/t stretching and then doing some at home, was a big down fall for me. ( in the end I believe it will be a costly mistake, think some of my wound care clinic cost won't be fully covered by my insurance as I used out of a network provider.Thankful for the group of people that provide this care and it is worth every penny. But in my case I think a lot of it could have been prevented.)