Exercises for stiff joints include contraction exercises, knee flexion exercises, and weight-bearing resistance training. 1. Contraction exercise: In the first week of rehabilitation, the stiff joint limb needs to be elevated to improve edema. In the second week, isometric contraction of the quadriceps muscle should be done to help the joint recover, and in the third week, the number of functional training should be increased. 2. Knee flexion exercises: start knee flexion exercises in the 6th week, bending the knee so that the lower leg hangs over the edge of the bed, and then go down to the ground, can further improve the stiffness problem. 3. Weight-bearing resistance training: In the 8th week, you can go down to the ground to carry out weight-bearing resistance training, firstly, the knee joint is flexed to more than 90°, and then walk slowly to help improve the stiff joints. After adapting, appropriate weight-bearing will help the body to adapt and restore the movement of the joints. Joint stiffness rehabilitation exercise at the same time, appropriate to increase dietary nutrition, more vitamins, protein, avoid eating spicy and stimulating food, to help recovery. In case of joint stiffness, consult your doctor in time and formulate a reasonable rehabilitation program under the guidance of a professional doctor.