Time to revive this thread. I'm now just past eight months and consider my recovery "complete", though I'm still experiencing a few issues that hopefully will go away with time.
I'm still at 140 degrees bending, though it takes a few stretches to get me there. But once I am there, I can bend that much without any pain. Since my knee has a limit of 145 degrees bending, I'm not going to push any further. I can do pretty much anything I want except deeply squat and my right knee doesn't like that so it's never something I do.
I've spent the last couple of months trying to fully rebuild the strength in my left leg. I'm at over 90% strength compared to my right leg, but all of this gym work has increased my force generating capability in my right leg well beyond what it was before I had my knee replacement. So even though my left leg is stronger than my right leg was last year, it's still weaker than my right leg now. I still have a leg size discrepancy of about a half inch in circumference. No lie - it has been extremely hard work to build muscle at age 62. Here's how things look today.
I may be reaching the point where any further strength gains are going to put my knee in danger. I'm not sure how much force it can withstand but I can squat a 225 pound barbell to 90 degree bending. Any more strength won't help me move faster or jump higher since I'm limited by muscle contraction velocity. And I'm getting hints that the knee thinks it is enough. I get a little bit of soreness under the kneecap after a heavy lifting session, and a little bit of soreness on the sides of the knee doing hamstring curls.
On the court, I'm still working to overcome some knee protection habits I developed over the two years before my knee replacement. The main problem I have now is that when I take off in a sprint, if my right leg is the first pushoff leg, I can run at full speed. If my first pushoff step is with my left knee, I tend to shuffle run. I can first step pushoff and sprint in training but can't on court. It's perplexing why this is happening, so I'm going to schedule a couple of sessions with my physical therapist to see if there's some biomechanical reason why my brain won't leg me do things properly. I can run 100 meters in 15 seconds so Usain bolt is only 50% faster than me now!
I've also lost the ability to backpedal freely. Again, it's something I can do in training but put a racquet in my had and a lob over my head and it's compromised. Overall, no complaints though. With a more stable base, I'm hitting the ball harder and more consistently, and have court coverage mostly like I did five years ago.
So, what still is the biggest problem is that I can't sit with my knee bent for extended periods of time. Sitting in a movie theater or an airplane seat, and sometimes even when driving for more than 30 minutes and my knee aches to the point where I have to stand up and walk around for 10-15 seconds to make it go away. Sometimes it will then go away and I can sit with the knee bent for hours more without discomfort. Other times, the aching returns after just a few minutes. There doesn't seem to be any rhyme or reason.
The skin sensation is returning, and so has the itching. This varies from day to day, with some days being pretty unbearable and other days with no itching at all. The left knee still feels warm all the time. I'm told these symptoms usually disappear by the one year mark.
I've pretty much stopped taking Advil. I used to pop two or three before each tennis session to keep the knee painfree after playing, and now I will only take one Advil if the knee is a bit stiff after a heavy lifting day or if I've played tennis more than a couple of days in a row. I'm hiking double digit miles and riding my bike at high intensity with zero pain.
Overall, 99% good and 1% bad! I hope the rest of my metal knee brothers are doing well, and those of you who may be looking at knee replacement get some confidence that a full and complete recovery is possible. Not just from my story but from the others who have posted here. My best to all of you.