Though it is skiing for me and not boarding, I did get back into backcountry riding. My annual heli-trip to Canada would have been six months post surgery, and I passed on that trip since I did not feel ready. I did heli up in Canada at 10 months. It went very well, but I was pretty conservative in terms of air time. After one year, I was back to my annual heli trips up there along with some cat trips, and feel very comfortable with everything backcountry, including small to medium drops (up to about 15', anything bigger and my 62 year old body just says no). I think that you will do fine at getting into backcountry riding, but take it easy for the first year, and after that you might want to be smart about any sketchy landings.
Good luck with your surgery.