A patellar fracture occurs, the first step is to immobilize the patellofemoral joint. During treatment, the primary goal is to prevent the formation of lower limb thrombosis. Therefore, early on, patients can be actively guided to contract the quadriceps and calf triceps muscles, while also performing dorsiflexion and flexion exercises of the ankle joint to avoid ankle stiffness. As the condition stabilizes, a cushion can be placed under the knee joint to allow for active flexion of the knee. If the fracture has stabilized, the patient can sit at the edge of the bed and let the knee naturally flex downward. If there is difficulty, the healthy limb can be used to help push and squeeze the injured limb to achieve a flexion close to ninety degrees. Patients can also lie in bed, hug their thighs with both hands, and flex the knee joint beyond ninety degrees to enhance this type of knee exercise.