1, loosen the patella: determine the patella position, all four directions need to be fully loosened, good knee patellar mobility as a reference, each time push to the end to maintain more than 10s, 5min in each direction. 2, scar loosening: for the scar that causes the flexion of the knee activity disorder, each time give 10min of massage loosening, release the scar adhesion. 3.Sliding board exercise: prepare a smooth wall, the patient lies on his back, the patient leans against the wall, slides down slowly to the end with a little pressure and holds for 10s, then slides up, also to the extension position and holds for 10s, reciprocal exercise for 10min. 4.Supine joint loosening: the patient lies on his back on the treatment bed, fixes the patient’s pelvis with a therapeutic strap, the therapist gives the patient knee flexion joint loosening. 5.Elastic band prone stretching: The patient lies prone on the treatment bed, fix the patient’s ankle with one end of the elastic band, and the patient pulls the other end with force, holding it for more than 10s each time and repeating 20 times. 6.Elastic band supine stretch: patient lying prone on the treatment bed, fix the patient’s ankle with one end of the elastic band, fix the other end on the foot of the treatment bed, give a certain tension, hold for 1~2min each time, repeat 10 times. 7, flexor strength strength: increase the flexor strength training can well maintain the mobility of the flexor knee, each hold 5s, 10 times / group, 3 ~ 6 groups of training. 8, standing position flexion knee balance training: each standing 5s, alternate feet standing balance training 5min.