They're pretty agressive about therapy these days with ACL reconstruc. They want you mobilizing that leg a day or two after surgery. As painful as it will be, try and put as much weight on that leg as soon as possible. I'm not saying go and ride or even run, but walk and stretch as soon as the doctor tells you to. They wanted me walking up and down stairs 2 days after my surgery and wouldn't let me leave until I showed them I could. Seems to work, here I am 13 years later riding 48x16 brakeless everyday. Good luck and godspeed recovery.