When the patient’s patellar fracture rehabilitation training, flexion and extension pain and weakness, can be improved through general treatment, drug therapy, physical therapy and other ways to improve the condition. 1. General treatment: it is a normal phenomenon for patellar fracture to cause pain and weakness in flexion and extension, patients should pay attention to rest, avoid excessive exercise, and massage the leg muscles appropriately during the recovery period to prevent muscle atrophy. 2. Medication: patients can take oral pain medication, such as Celecoxib, Loxoprofen sodium, Aminophenol Phenobarbital tablets, etc., as prescribed by the doctor 30 minutes before the rehabilitation training to reduce the sensitivity of the patients to pain, so as to alleviate the symptoms of pain and weakness in the rehabilitation exercise. 3. Physiotherapy: patients can apply local ice packs after rehabilitation training to reduce soft tissue edema caused by the rehabilitation exercise process and relieve pain symptoms, and also through ultrasound, ultraviolet rays, magnetic therapy and other physiotherapy modalities to promote local blood circulation and inflammatory absorption. Rehabilitation training after patella fracture should be carried out scientifically under the guidance of doctors, avoiding over-training to promote fracture healing and functional rehabilitation of the knee joint.