Ouch!!! You can take solace in the fact that a broken bone is far better than a lot of other things that take much longer to heal or never get back to 100%.
I feel for you being an ACL surgery survivor and currently suffering from Osteitis Pubis for the last 18 months that prevents me from running. I can bike though.
When researching for my ACL surgery I ran across a study that showed working the the good leg actually tranferred to the bad leg. Like stationary bike with the good one while in the cast and the broken leg will be in better shape when the cast comes off.
Get right on the rehab when you can and good luck.