howdy go and welcome to the board. If you haven't had a chance yet (and while you're recovering) pop on over to the "getting to know you" thread and spend several hours giggling at us and then - if so inclined - tell us something about you!
as for the knee: you injured it in June and just went to the Dr 2 wks ago so you probably continued to aggravate the injury during that time. Give it some time and some rest - it'll get better and the bike will wait for you! You'll thank yourself in the long run my friend!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"