Of course you'd have more flexibility right after the procedure because it takes a little time for the swelling to build up. Please take things very easy and give your poor wounded knee some time to heal. You want to minimize swelling and inflammation, so that means rest, ice, elevation and some type of medication on a schedule if you have pain. You should not be attempting a lot of exercise. Just gentle bends and stretches throughout the day and some walking about the house every hour or two for at least several weeks. I think your plan to skip formal therapy right now is a good one.