Make sure your crutches are set right
I've actually worn two pairs of crutches out so far, I'm on my third. You don't want to have the under arm part against your armpits - they should be a couple inches lower. They aren't for support, you should be using your hands to support. When you stand straight up, the hand piece should be right at your wrists.
Ice your knee until the swelling goes down, and then start passive motion exercises (bending it and straightening it when you're in bed). Start doing lifts - sit on the edge of the bed or a high chair - and straighten your leg out from bent. After a bit, stand behind a chair and hold on and do mild squats, only a few at a time. Take ibuprofen (Advil or Motrin) to help the inflammation and swelling. You can take up to 800mg 4 times a day.
If it helps, and you're good at wrapping, use an ace for support (I like the 6" wide ones, not the smaller width ones), and wrap in a figure 8 fashion, like you would wrap a hock. I've had to have my knee wrapped since pretty much July (surgery and wound issues, I can't have tape, so I have to wrap it to keep the dressings on). If you wrap it right, it will stay put.
Pretty much that's what you'll be told if you go in. If you tore ligaments (and I have - my last surgery was to do tendon grafting to replace them), you'll know it since your knee just won't work right (mine would "separate" and my lower leg would drag when I tried to walk).
Also, it doesn't hurt to slap some liniment on there too. I still love the smell of Vetrolin
