Patient: I am now two days and five weeks short of post-op and bending is 90 degrees, I feel no progress in the angle these days, some of the information I read online requires 90, some 120, how much should I do now to meet the standard? Doctor: You are using an autologous tendon to reconstruct the ACL and it should not be too difficult to perform post-operative knee flexion exercises. The general post-operative knee flexion requirements are: 90 degrees 4 weeks after surgery and 120 degrees or more 8 weeks after surgery. I wonder if you are doing knee flexion exercises along with patella pushing exercises? What type of knee flexion exercises do you perform? I don’t recall if you had a 4 week post-op review? If not, would you please come back for a review before the year is up? Patient: I had a 4-week follow-up and was told that the angle was less than 80 degrees and that the patella was moving fine. Then I barely got to 90 degrees at 5 weeks of rehab (on the 16th). I looked up everything on the internet, so I was confused. I used a seated overhead wall and today tried supine leg pounding. Doctor: With good patellar mobility, the angle of knee flexion is usually not a big problem after ACL reconstruction. You can gradually increase the angle of knee flexion, and you can also apply local heat before exercise, which will help your exercise. At the same time, you should pay attention to the exercise of knee extension, that is, leg press.