For the longest time I couldn't figure out why I would go down, with no pain or any other "apparent" mechanical problem. Just walking along one minute, and down the next.

I finally figured out that it has something to do with my knee not providing the right connection between the thigh and shin bones of my leg, and to be honest I don't even know if my leg stays too bent, or bends too much the wrong way or ? . . . I just go down.

Sounds like your situation is different . . .

Is there any other exercises you can do, or ANYTHING that might help strengthen/straighten the leg?

Good luck with the brace.

Cherie