hey, i ripped my ligaments in my ankle before i was on cruches for 3 weeks and it was still swallon up. it healed with in 3 weeks so you should be riding soon.
i would reccomend 20 inch if you are qwite short if you are average size i recomend 24 inch but if you are qwite tall i would reccomend 26 inch i ride 20 inch