Do you still see a lot of swelling? Swelling reduces ROM. Even if you don't see outside swelling you probably still have it inside your knee. That is a small space and a little bit of fluid will restrict movement and give you a worse ROM. Do you have time before you MUA to rest your knee with added icing and elevating? You will probably find that your bend will improve without the damaging MUA. Jaycey is correct. When you have the MUA, it creates lots of inflammation in those injured, healing soft tissues, so you have to treat your knee like you did in the beginning of your recovery. MUA does help a few people, but many find that it doesn't help them, that all they needed was more time.