Getting Back From an Injury

Greetings and Salutations,

I recently injured my knee in such a way that I cannot walk without the help of crutches. I'm sure that the doctor will want me to use it again, but I don't know where to begin. I've looked up yoga forums for at least keeping the muscles from atrophy, but what can I do over the weekend so I can be ready for "walking" on Monday, when I see the doctor, and possibly walking to work after that (no car, have to walk to bus stop).

Thanks!

Silelda