Over done it?

I am in my 7 th week post TKR, I'm 78. My bend is 105. I went to my PT yesterday,he seemed  quite pleased with me but always makes me feel I don't put enough effort into my exercising .he asked how far I walk a day & I confessed @ 20 minutes. He said I needed to double that. So I went off this morning & walked for one HOUR. Since I've been home my knee has been on fire , burning like mad .i keep putting lots of ICE on but it doesn't help much. Have I caused a setback, does it mean I will have yet another sleepless night, or will it soon  recover, help !!! ?  I so want to do  the right thing so I can get back to normal. The cause of my TKR was an injury not arthritis, 

And your PT is. . perhaps . . 25?  I wonder how far he/she will be walking at 78!  Well, the good news is that when you overdo it you get a bad day like this, but usually the next day things are back to normal . .Better advice would have been to increase the amount of walking graudally, day by day . . Hope you'll soon be back to normal again. 

 

Thank you Martinarvelo that's reassuring. I had a rough night & knee feels very stiff this morning but hopefully as time goes on & I rest more it will improve