Make sure you get a release and talk to the physical therapist. It is always a good idea to connect to them in case you have a quesiton later. I never knew a physical therapist who did not happily agree to it.
Before I would worry about the leg itself, I would do an assessment including a gait assessment. After a knee surgery, the gait is always off somewhere, and it is a good opportunity to look at the entire person and identify those imbalances that have moved in secondarily to the actual knee injury. This gives you an opportunity to work on those and ‘sprinkle’ the knee specific exercises throughout the workout
I would initially continue with the PT exercises (which are probably quad sets, straight leg raises, hamstring curls, calf raises, shallow knee bends) and gradually add lateral step ups and other closed chain unilateral exercises. There is one I use with many of my ‘knee’ people. It is called ‘Terminal Knee Extension’ and works the end range of this movement. I picked it up years ago at a post rehab course from Dr. Michael Jones and have used it ever since. I actually found a Youtube video for it which saves me a lot of words. http://www.youtube.com/watch?v=ZscBVtoX62U
Particularly when I begin working with a client as a continuation of physical therapy, I often end the session with an ice pack on the client’s knee. The knee is often still swollen anyway, and it really calms the area down very well.