I broke mine about 2 years ago.
Get a good physio, get a wobble board, a goal and speak to your consultant and let him know you want to push yourself to recover rather than sit back and hope for the best.
You need things that push the full movement – which cycling doesn’t (I was able to cycle to work before I could walk without crutches – I strapped them to my backpack).
But in all these cases it is best to do with professional advice rather than from here.
I broke mine in Jan and rode the London to Paris in June, which was my goal – a result I think. Great to have something to work towards.