Hey man; I got one of these when I broke my ankle (or maybe it was a really bad spraign, if you trust the doctor..but I dont)...anyway...it is this thing:
http://www.braceshop.com/productcart/pc/DonJoy-MaxTrax-Air-Walking-Boot-10p870.htmIt helped me out a TON. I couldn't even stand up without being in tons of pain without it; but with it on I was walking up and down stairs with not so much as a hitch.
I highly reccomend one. If you are a bigger guy; I can sell you mine. I'm 6 feet even; 180lbs...shoe size 10. And mine fit me snug...I think its pretty much universal...I think they have Small, Medium, and Large. Mine is the large but its got adjustable straps on it that you can tighten a lot... If you want it; shoot me a pm I'll send it to you for $50 + shipping. Pretty sure thats a lot cheaper than you can get one anywhere. And mine is in 100% condition...
Even if you don't buy mine though; I really highly reccomend one of these...they saved me for the month it took my foot to heal.