Hi wxy555. It seems your surgeon did not refer you for physio. You see, in most cases, reduction of the fracture of the long bones are accompanied by the stiffness of the associated joints b/c they must be kept immobile to allow smooth fracture healing.
Post immobilization rehabilitation is essential in most cases and your Dr should have prepared your mind for physio.
Nevertheless, u need a physiotherapist at this stage to mobilize your stiff knee. Your hx reveals, u might have developed extention lag of that knee.Yes the exercise i prescribed is appropriate for u but u need a physio to mobilize your knee in order to improve your knee range of motion and to prescribe case specific rehab program for u.
You may remind your Dr to consider referring u for physio.
Your fracture can be healed and still have gross limitation in joint motion.
With adequate rehab you would be out of this soon.yelufem.