oh no romy that sucks!

well, people used to use prosthetic legs which were basically a lower leg that you kneel on top of.  so picture an upside-down L and your bad leg is bent at the knee 90 degrees.  your lower leg is strapped onto the top part of the upside down L.

you put a bunch of padding on the top, and use padding on the back of your calf, and then you can wear it for hours and walk on it just fine.

people whose feet or legs were chopped below the knee walked around on such things their whole life.

like this:
http://gajitz.com/running-start-temporary-prosthetic-for-lower-leg-injuries/