Knee mobility exercises should emphasize the improvement of each activity in the exercise, rather than the number of times and the speed of joint activity. Exercise methods are: 1, push the patella exercise: avoid patellar adhesion for the prevention of knee adhesion is important, the patient himself or accompanying personnel, hands pinch the patella to do up and down inside and outside of the four directions of activity, activity to the opposite side of the patellar range of motion as a reference, daily activities of 3 ~ 5 groups, each group activities 5 ~ 15 times. 2, bedside leg drop exercise: patients do bedside, the affected limbs naturally relax and droop, insist on 1~3 minutes counting once, practice 3~5 times a day. This exercise is the first level of joint mobility exercises, belonging to passive knee activities, suitable for early postoperative joint mobility is not greater than 90 ° when used. The precautions are: the patient from lying down to the bedside of the process should always have someone to protect the patient’s knee, to the bedside to protect the patient’s heel and gradually make the affected limb droop, early avoid patients to move to the bedside unprotected to do the droop exercise. 3.Knee lifting exercises in bed: in bed by the escort with both hands to hold the N nest will be lifting the knee upward, so that the knee flexion, let go and slowly straighten the knee joint. 3~5 groups per day, 5~10 times for each group. This exercise is the first level of joint mobility exercises, belonging to the passive knee joint activities, suitable for fork ligament reconstruction and meniscus suture within 2~4 weeks after the application. 4, prone position pull back exercise: the patient prone position, with a wide cloth belt or elastic band around the back of the foot, the patient himself will be affected side of the lower limb foot pulled toward the hip, so that the knee joint flexion. Each time the knee flexion to the maximum degree, so that the patient’s knee joint has a sore feeling, keep about 1 minute. 3~5 sets per day, 1~3 times per set. This exercise is a joint mobility level 2 exercise, which is a passive knee activity, suitable for patients whose knee mobility is already greater than 90°.