Patient: Description of condition (onset, main symptoms, hospital visited, etc.): Hello, Director Wang, I had the honor of having my left knee ACL reconstruction and partial meniscectomy surgery performed by you on June 9. Nearly four weeks after the surgery, I have some questions. 1) I still feel some pain on the front of my knee, especially when I stretch my leg. 2) I feel pain on the back of my left knee from time to time, like a crapping sensation. This is obvious when stretching the leg straight or walking. 3. now flexing the leg can be nearly 120 degrees, but at the beginning of the flexion did not reach 90 degrees of the case will be some pain, and will be relieved only after a while. When I reach 120 degrees, I already feel very hard, and the left side and the back of the left side of my knee are very painful, and after the exercise, there is a significant soreness, and it takes some time before it is normal. Is the above reflection normal? Which area should I strengthen my practice again. Thank you. Wang Jiangyan: Normal, just practice again. Patient: Thank you for your busy reply. One more question, my mother doesn’t dare to break me because I am still a bit short of 120. She is afraid to break it. The plan says 120 degrees in four weeks, but it doesn’t say how much I need to reach after four weeks. How should I train. Wang sound: After reaching 120 degrees it is good to practice, eight weeks to practice to normal. If you feel pain, it is often caused by the usual non-exercise, too much protection, more walking, more practice up and down the stairs. Patient: Thank you for your guidance, I am now on day 5 of the sixth week, passive knee flexion to about 140 degrees, practice is very hard, very painful, indeed, as you said, I also feel that I am somewhat conservative, exercise less time, about half an hour a day, you said too much protection, so can I take off the brace and walk. Although I am doing leg lifts every day, my left leg is still very thin, mainly because I am afraid that too much exercise will put a burden on my knee and loosen my ligaments. I hope you can give me some advice. Thank you very much.