Rchan,
First the bad news - you may need to give up on Cycle Oregon this year. Rehabing your knee is more important.

I tore my MCL and partially tore the ACL in a bike wreck last year. Did 12 wks of PT, which was so much fun. My PT even pointed out the atrophy from non-use when I first started. When I was finally approved to ride - on bike trails, not on streets, to lessen the risk of falling again - I still didn't have a happy knee.

Good news is that there is recovery.

yeah, and I need to call an orthopod here because a year later, and a cross-country move, my knee let me know that the twist I did while playing a game of chase with the cat was not a smart thing to do.