Rehabilitation exercises after knee fracture are mainly functional mobility exercises and muscle strength training. 1. Functional mobility exercise: after the knee fracture, when the clinical healing standard is reached, the functional training of the knee joint can be carried out, including extension and flexion functional training. The specific program can let the patient sit on the bedside, actively lift and flex the knee, the flexion angle should reach 120 degrees or more, the straightening angle should reach 0 degrees or -5 degrees, so as to better prevent the limitation of the joint function and the stiffness of the joint. 2. Muscle strength training: while exercising the functional mobility, muscle strength training can be carried out, the knee joint resistance training can be carried out, sandbags can be tied to the ankle joint, knee lifting training can be carried out, so as to exercise the strength of the quadriceps muscle. You can also place a leather band at the back of the ankle for resistance knee flexion training, thus exercising the strength of the hamstring muscle. Only when the muscles are strong enough can the joint be stabilized and the healing of the fracture be accelerated. It is recommended to go to a rehabilitation center/rehabilitation department for postoperative rehabilitation if possible, so as not to fail to achieve the effect of exercise and rehabilitation due to personal movement irregularities, and to pay attention to arranging personal rest time, gradual and orderly, and the specific exercise should be guided by a professional doctor.