It usually takes about three months to return to normal after knee replacement. Knee replacement is a widely practiced surgery, which has a good effect on advanced knee degeneration and other causes of joint pain and activity limitation. After knee replacement, you can leave the bed with a walker in 2~4 days, and through gradual rehabilitation, you can basically walk normally without crutches in about 6 weeks. After 6 weeks, further rehabilitation is needed to strengthen the muscle strength, joint flexion and extension exercises, as well as walking activity training, in about three months, basically can reach the normal functional status. After the knee replacement surgery, you must strictly follow the doctor’s requirements to carry out rehabilitation exercises step by step, in order to promote the limb function to recover as soon as possible.