The most important thing is to push to achieve full range-of-motion (ROM) as soon as you can WITHOUT risking further injury. The best way to help with this is once the wounds heal to get in the bath tub and gradually increase the temp of the water. Soak for a while and then do ROM stretches. Do this EVERY night until you achieve full ROM.
Make no mistake about it you will be sore for a few weeks. Ice the knee to prevent swelling and sleep at night with an immobilizer on the knee to prevent inadvertant movement or putting your knee in a compromising position while you sleep. You will regret it if you don't.