I was too lazy/busy the last 3 weeks to go to the gym. I just went swimming a couple of times.
I visited my PT 2 days ago. ROM 140 degrees which is more than the normal (125-135), but still not my personal normal (~150). The PT was happy with the results. There is still a bit difference between the miscles of my legs, but it's only ~1cm. The PT sait that everything's fine and the fact that I didn't have any problems till now means that the implant is fine. I have lately acute sharp pain where the big scar is. He said that's normal because some of the sensitivity is coming back. I should also start doing some sport (dances, joga.. whatever). That will help me keep my leg fit. And I'm happy the PT said I can ice skate.
I still don't feel completely recovered, but everything's great for now.