First of all, when you decide to do functional exercise, you should review the X-rays to make sure that the bones are healed and the internal fixation is firm.
Second, if there are abnormal situations, such as your current situation, stop exercising.
It is normal for the affected limb to be fixed for a long time, resulting in joint stiffness. The only way is to speed up the functional exercise as soon as possible, and don't be afraid to pay attention to the method and intensity. Otherwise, the joints are stiff, so there is only surgery.
Personal point of view