Patella fracture in a cast usually recovers in about 3 to 6 weeks. For non-displaced patella fracture, conservative treatment is used, anterior and posterior long leg plaster cast is a feasible treatment method, in the early stage of straight leg elevation exercise, and throughout the whole process of plaster braking, and can be partially weight-bearing with a plaster, general plaster braking for 3~6 weeks, and then switch to elastic bandage compression bandage, 3~6 weeks to reduce the physical activity, can be active and passive functional exercise. If the immobilization time is too short, the fracture end may be displaced, and too long a period of time will lead to adhesion in the joint. If patella fracture is diagnosed, it is recommended to go to the hospital in time and have standardized treatment under the doctor’s guidance to avoid adverse effects.