So sorry about your complications, but your attitude ROCKS!

Just to second what Xrayted said, my dh had a motorcycle accident when he was younger, and he too almost lost his leg, was told he'd never walk without a brace, never bend his knee to 90 degrees, yada yada yada. None of that turned out to be true, and while he still has a zipper of stitch scars up his thigh, and will probably need his knee replaced in a couple of years, he's the most active 58-year-old guy I know. Seriously. Stick with it--you're doing great!