Bernie
I do believe that one can achieve a level of sport competition/involvement after AN surgery. Although the level won't be as high as before surgery and may be slower going, it definitely can be achieved. Since my surgery 2 1/2 months ago I have cycled, swam, kayaked, bowled, played catch with my 17 year old son (although I won't squat to catch his 90mph fastball any longer,mainly due to vision issues) and ran. I am just about ready to enter a 5K run which I haven't done in about 5 years. I'm not out to win the race and I really don't care how fast or slow I run, I'm just looking to finish.
I realize that everyone's surgery and recovery is different, but it sounds like you are more than ready to give it a go. Your body will let you know when you have had enough (you may not feel it untill the next day, so don't over do it).
As Steve mentioned, "Athletics and Post AN Life" is definitely worth a read. Lot's of people on this site are very active!
Good Luck
Joe B.