Had surgery for a torn meniscus - what post-op exercises should i do?

Quad exercises: Any trauma to the knee (including surgery or arthroscopy) can cause quad inhibition, where the quad muscles stop functioning normally. It is most important to retrain them to work properly. Walking without a limp, exercise bicycle, stairclimbing, lunges, and squats are all excellent ways. Isometrics (holding the knee straight for long periods) is another excellent exercise.