Finally it seems that my patience has paid off. After more than two months of patient recovering and therapy it appear that I'm ready to start running again. This week I've been running three times. A short session on Monday and Wednesday and a longer session on Saturday. It's been pretty tough not to be able to run for such a long period of time, but luckily I've been able to be active in other sports-especially cross country skiing.
No trace whatsoever in my knees. Important now is to be patient and not move to fast when it comes to number of sessions and total volume.