Figure I’d close out this thread for future sufferers. The following day after I wrote this ‘depth of despairs’ missive, I woke up and my knee could suddenly bend 25 more degrees. Since then I’ve been on a strict PT regimen and slowly ramping up the bike. Obviously I temporarily lost a lot of fitness and the time away took a particularly hard toll on the high end efforts and hills. I’m doing lots of squat like strength exercises to rebuild the muscle and retrain the neuromuscular system. I suspect this rebuilding is playing into some of the difficulty on hard efforts. At the current rate of improvement, I think I’ll be back to form in 30-45 days.