Lauri, I had bilats done over 6 months ago, and have had some of the same symptoms you have. My right leg is much weaker than my left, it has less range of motion and I have pain down the outside part of my femur to my knee and sometimes feel that weakness you spoke of that makes me think my knee will give out. It also have really bad lower back pain. It started at about 3 months post op, and I went back to PT, and it has improved a lot. I'm told it is my IT band, and some hip bursitis. I think it is quite common to have these complications and they will get much better with time. I'm told it takes a year to completely recover. As far as my hips go, they give me very little pain, and if my back didn't hurt I would be in great shape! Give yourself time. On the bright side, I have really good range of motion, even with the right leg, which is not as good as the left. I If you are not doing PT, I would suggest you start again, and I think stretching is good for the IT band. I hope this helps and I hope you are feeling better soon.
Mary Jane