Hi!
It depends on what the surgical procedures were. What kind of cartilage replacement? How was the meniscus treated?
At this stage you still have to be careful. Of course you can do every training that’s not involving the knee. If you are cleared for cycling I would gently increase that aus cardio.
Most important: follow your surgeons advise!
Hope that helps a little!?
Gute Besserung!
Thomas