In reply to Lee Sheard:
Sounds like you've done something very similar to what I did 5 weeks ago. I've a complete rupture of the ACL, and partial tear of the medial collateral ligament (MCL: the opposite collateral ligament to yours). Like you, the binding didn't release - we assumed it had frozen up but perhaps it's actually because it was relatively low speed.
The docs in Italy were all for operating the same day, but my insurance declined to pay for it. Probably a good thing... it turns out this is one of the things that the UK are better at.
I'm in an articulated knee brace for another week or so, and then I can start weaning out. That's to ensure everything stays straight whilst the MCL heals itself. I ditched the crutches all together after about 3 weeks, when they started becoming more trouble than they were worth and I decided I needed to focus on walking straight.
For the ACL, it's going to be an intensive programme of physiotherapy, to retrain the knee to work without an ACL. Hopefully I'll regain good enough function to not need surgery. If I do need surgery, all the physio will have served as pre-operative "prehab" to get in good shape for it. Both the Orthopaedic surgeon and the physio have been very clear that physio is super important: if you don't do the physio, and therefore don't regain knee function, then they won't consider you for surgery because it would just be wasted effort (because you need to do lots of physio post-op too). Unfortunately there isn't a way of telling early on who will or won't need surgery.
As it happens the physio who's currently seeing me at the hospital is someone I already know from the climbing club. Currently the exercises are all about strengthening the muscles, and also getting the knee to go properly straight (to ensure the MCL doesn't heal too short). As I understand it, as I progress, I'll move to the gym with circuit-style sessions where they progressively increase the complexity: walking / jogging / running in a straight line, then big circles, then tighter circles, adding in more sudden movements, etc. If you get stuck at a certain point despite proper effort, that's when they'd send you back to the surgeons for consideration of surgery.
They've told me that many people do just fine without surgery, and indeed there's a physio in the department who has no ACL in either knee and skis steep stuff just fine. So that's reassuring.
Oh, and they're super keen on cycling as part of the physio/rehab process. Like, really keen.
From what they've told me, it doesn't feel ridiculous to be thinking about skiing next winter.