Exercise steps: 1, postoperative pain relief to start training, generally the second or third day after surgery can begin; 2, the body lying on its back, the affected leg straight, try to make the knee joint straight; 3, slowly lift the affected leg, heel 10-15cm from the bed, then hands holding the thigh root of this leg, further raise the leg to the maximum, maintain 3-5 seconds; 4, relaxed restore, put the leg back to the bed. After a short period of muscle relaxation, repeat the action just now; 5, can be carried out 3-4 times a day, each straight leg raise 30-50 times, alternating legs; 6, the number of exercises is not absolutely required to reach, should focus on gradual, in the case of non-exertion, try to gradually increase the number of exercises; 7, the process of raising the leg, the waist does not leave the bed. Straight leg raising training should generally last for 2~3 weeks, especially in the early postoperative period of 1-2 weeks is very important; 8, the exercise process requires no obvious pain, the initial stage can be assisted by family members to complete together, and then gradually reduce the power of the aid, by the patient to complete completely independently.