I know so many people that have bad Knees, ankles and legs that still bock so I would say yes you still can bock
The only proviso is how extreme you can get and that depends on when it starts hurting
As for bikes and cars I have been cyclist, motorist and motorcyclist for many years and used to cycle 15 mile each way commute in London traffic (now do it on a motorbike)
While I agree that a lot of car drivers have a total disregard for cyclist safety I also have to say that some cyclists seem to have a total disregard for there own safety
On my journey into work I see at least 20 cyclists a day deliberately jump red lights or throw themselves almost under cars expecting the drivers to stop to avoid them
To be fair I see the same number of motorists cut cyclists up due to either inattention or shere Bl**dy mindedness so I would say the score is about even
And before someone points out the obvious Yes I am one of the nut job Motobikers that gives them all a bad name
Anyway hope the leg heals well mate and hope to see you at a meet one day soon
Jason