If you are already post-operative on the knee and have difficulty practicing knee flexion and extension at the angles prescribed on your rehabilitation program, the following adjustments are recommended: The main reason that many patients have increasing difficulty with post-operative rehabilitation is that they practice too many exercises, either once a day or more than once a day. Too many exercises lead to post-operative swelling and edema of the soft tissues in addition to the surgical stimulation of the knee, and increased tissue edema due to excessive exercises, possible intra-articular effusion and joint burning, and possible muscle stiffness, so that the knee joint becomes increasingly stiff and difficult to practice. Therefore, the first task to solve is to practice every other day. Some people even need to practice twice a week in order to prevent knee discomfort from getting harder and harder. Shorten the duration of each exercise to within 5 to 10 minutes. Compared to 60 minutes per exercise, 10 minutes per exercise is only one-sixth of the stimulation to the knee joint, so there is less risk of swelling, burning and hardening of the knee joint. Never use 2 minutes if you can finish the exercise in 1 minute. Try to practice by yourself every time and not let your family push you. You can practice on your own with your hands on your legs, you can sit on a chair and move it forward with the toes of the affected limb against the wall to increase the angle of knee flexion, or whatever method you want. The advantage of this can avoid the family to help push when they will be more forceful, the more forceful they are the more forceful the family, so that the knee and thigh muscles will be more stimulated, easy to lead to knee swelling and muscle stiffness. Conversely, if you practice on your own and then relax well, you can solve the problem. Each exercise requires an increase in angle of 1-2 degrees. Any more pain has to be tolerated. Never stop every time you practice until a certain angle starts to hurt, and get lucky thinking that next time, this will lead to delayed recovery and adhesions occur. Adhesions that could have been opened over time will become solid scars that cannot be connected and sometimes require surgical release. Reduce other exercises on the rehabilitation program, i.e., suspend all other exercises on the rehabilitation program except those that practice knee flexion and extension, if the exercises do not go well. This will reduce knee irritation and stiffness caused by other exercises and promote progress in the rehabilitation angle. Reduce activities of daily living. Some patients with unsuccessful flexion and extension exercise angles are told to suspend other exercises on the rehabilitation protocol, and although he does, he keeps going shopping, resulting in no reduction in knee irritation, which interferes with rehabilitation. Adjusted according to the above six, the general patients do not have to go to the hospital to solve the problem.