Thank you for your interest, Fastboy! I gradually progressed to 3 miles non-stop on asphalt by the end of November @ average pace of 8:40. But, for several weeks in November, I had nagging shin pain in my operated leg (left) during the later stages of my runs and afterwards. My PT did a gait analysis and concluded that my left knee was caving in intermittently. My left knee would actually lightly brush my right knee at times during a run. My PT advised me to take some time off from running and do a series of exercises specifically aimed at strengthening my gluteus and piriformis muscles (the ones that are temporarily damaged during resurfacing). I listened to him and took a full week off. Then, in mid-December, every other day, I ran 4X400 meters, walking 200 meters in between each lap, then 2X800 meters, walking 200 meters in between each 2-lap interval. These runs were on a rubberized high school track. I also did the exercises with intensity. Today (Dec. 26), I am happy to report, I ran 2x1 mile on my favorite asphalt trail with a half mile of walking in between and I have no shin pain. My first mile was at 9:02 pace. I was able to speed up to 8:33 for the second mile.
I was too inpatient with respect to what I did when I initially returned to running. Instead of patiently following the "return to running" protocol on Dr. Su's website, I extended the length of my runs too quickly and also, ran for speed (i.e., sub-8 minute miles) too quickly. My PT is a fan of the protocol where you run 3-4 minutes, walk 1 minute and so on and that is essentially what Dr. Su's plan advocates. So, if I could do it over again, I would take a slower approach.
With respect to my hip flexors, they are still a bit tight, but not the current problem according to my PT. Pre-op, my left knee did not cave in due to bone spurs and other issues and my left leg actually swung out slightly as part of my stride. Now the spurs are gone and the leg has greater range of motion, but the muscles that control the knee and parts beneath it need to be stronger. Gradually, they are getting stronger and I am extending the distance of my non-stop runs. Hopefully, there's a 5K in my future in early 2018!