I am another one with ROM still improving and I’m 2+ years post op. As time goes on my whole leg continues to relax, allowing more bend. My ROM numbers were great early on, but I was never measured by being allowed to bend on my own, my bend was always pushed for measurements, even by my surgeon. So I honestly don’t know what my true numbers were. Nothing like what was reported. Then I had a major set back at 4 months due to over activity which drastically reduced my ROM, and just as I was beginning to improve, my son got married and it was a busy weekend and out of town with little ability to properly take care of my knee and I was back to square one again. My ROM was very poor the rest of my first year and I was so stressed about it because ROM was my surgeon’s main focus. In spite of all that, now my ROM is fine. 4 weeks is still early in this year long recovery. Please try not to worry. You have lots of time to improve, and you will.