The question should only be directed at your surgeon. He's been inside your knee, only he knows the whole situation. Ask him. And don't do anything sooner that he tells you. If the goal is to see if some cartilage develops from the lesions he made, anything that grows there may be too fragile for some time to tolerate even the cycling. This is not the sort of thing you solicit marginally informed opinions about.
"Where's the REST of me?"
Ronald Reagan, in "Kings Row"