Your leg just isn't ready yet for sitting in a chair with your leg down. By pushing on the back of your thigh, the chair is also putting pressure on your knee. I think it was about 3 months before I could sit comfortably on a dining chair with my foot down.I've been following the progression chart more faithfully this time and wonder - am I doing too little? Sitting for more than 5 minutes on a chair is miserable because of the pain in the back of my thigh (tourniquet too tight?) so I'm either propped up in bed with ice from knee to ankle, elevating, and/or walking around the house for 5-10 minutes at a time and/or obviously going to the bathroom. When I think about it, I do a "few" exercises - but am not thinking much about ROM - if at all. Yesterday, I threw some clothes at the washing machine, folded up a few things, set the table the felt like I'd been taking care of the grandchildren for 72 hours - exhausting. I'm not exactly antsy but would like to walk to the backyard this afternoon after the p.t. and nurse get done with me. Going for a short ride this weekend sounds nice too.
If you can, elevate your leg while you're sitting in the chair - like this:
Even having your leg horizontal is better than having your foot down on the ground.
It's still very early days in your recovery. Try not to worry how your husband does things. Just be thankful that he's doing them. At least he's getting his daily exercise by going up and down stairs frequently.

New Zealand



And that the key does not belong in his pants pocket to be let loose in the washing machine, or tossed on his desk with his wallet, etc. I also hid a spare key for the mailbox to protect my sanity when he manages to misplace the first one. He's a great guy, but is also an absent minded professor when it comes to details. 

I don't care about someone's tidiness in their own home, or the lack thereof, I care about them. But since I live in my house, I need a tidy space in order to function properly. Most people, at least the ones I know, aren't overly tidy these days with all their many commitments, but I go to their homes to see them, not how they keep house. Unless there are critters roaming or bad smells pervading, I don't worry about any messes. 