Bland, did you see a vascular surgeon and did he/she offer any hope for that leg? I cannot understand why you have not had treatment for the blood clots and the subsequent damage. I know that Jo has offered a suggestion or two, but I am not sure that you have sought a solution through a vascular surgeon. Your knee's lack of bend has really very little to do with the TKR and Everything to do with the DVT.
I hope the same surgeon is not doing your other knee since he ignored the symptoms of DVT last time and did not seek treatment early on for your DVT. I am so sorry that you have suffered like this. I will say one thing, my husband walked with two sticks for quite a while. When he finally changed to a walker with a seat, he was so much happier. He had a walker with four wheels and handbrakes. It was so much easier for him to walk with the walker.