I've been through this myself, and yes I am a stranger but I'm also a doctor (really).
Basically, you can start cycling whenever you feel up to it. If anything cycling is better than walking or running as it is non-weight bearing. Cycle on a trainer first if you don't feel up to going out.
Start with short periods and build it up gradually. Don't have a pre-determined distance that you must do. Don't worry if the knee is a bit more sore after the exercise than before, it is unlikely you are doing any damage. You may also benefit from other exercises such a yoga or weights to build up flexibility and muscle strength.
I've been through this myself, and yes I am a stranger but I'm also a doctor (really).
Basically, you can start cycling whenever you feel up to it. If anything cycling is better than walking or running as it is non-weight bearing. Cycle on a trainer first if you don't feel up to going out.
Start with short periods and build it up gradually. Don't have a pre-determined distance that you must do. Don't worry if the knee is a bit more sore after the exercise than before, it is unlikely you are doing any damage. You may also benefit from other exercises such a yoga or weights to build up flexibility and muscle strength.