If you can stand you can bike.
All you do is use lifting strength to lift the foot and then let the weight of your leg push down. So you don’t actually push down any more than you have to do to stand. It does need low gears, and it needs a high up saddle so you knee moves the least. You can do asymmetric strenght where your strong leg pushes hard and weak leg just removes / restore leg weight from pedal.
Some people use an electric bike for the hills where simply the weight of your leg is not sufficient, the motor augments. Electric bike helps too in hot humid climates as uphills are easier where it matters most, on the flat you’re tuning how much is human power vs electric power to get sufficient velocity to evaporate cooler and exercise.
But this is best discussed with your medical professional, they know your unique personal situation better than the Internet ever can.
I did my knee in once in a bike accident (coming down a hill too fast) and as basically doctors don’t heal you (you heal yourself, the doctor just gives you confidence to) , I self diagnosed and healed myself. Initially I could not bend the knee enough to rotate the pedal so I rode one-legged (push hard good leg, bad leg just hang to the side) for a few days then got enough movement to bike and worked my way up. Took me I think 6 week to recover. I relocated my own kneecap and used Wikipedia to resolve the pain with the tendons and made my own recovery regime. But then we’re different people.
meditation, concentration heals most things better than chemical drugs.
