Functional exercise is quite important in joint treatment and needs to be persistent and varies from person to person and from time to time. Introduce several simple exercises for reference: 1. Leg press method: stand with legs apart and press backwards with hands placed 6-8cm above the knee. Each time 200 strokes, three times a day. Can release the posterior knee capsule contracture. 2, quadriceps static training: lying down, legs straight, lower limbs are not lifted, bounce tight quadriceps, patella upwards, both legs crossed. Last 5-10 seconds. 3, quadriceps power training: lying position, both legs straight, lower limbs straight, leg heel 15-20cm from the bed, for 10 seconds. 4, quadriceps adductors and adductors synchronized training: lower limbs straight, heel 15-20cm from the bed, outwardly unfold, inward, down. Continue for 10-15 seconds. 5.Sitting: kneel on the bed when making the bed every day. Do not abolish the activity due to pain. Sitting will not damage the joint cartilage. 6.Ball clamping method: Put the leather or soccer between the knees and clamp the ball with force. Clip the pillow can also be. 7.Walking: walk flat, try to walk as far as possible each time, not running, climbing. If you like to climb, it is recommended to climb flat slopes, not stairs. 8, swimming: can reduce the pressure on the knee joint and relieve pain.