The exercise routines I'm using are doing some good. Although I'm pain free for 30 minutes to an hour after my exercise, and I can feel that my knee is improving, it's too slow. I've got immediate problems.
Today while I was standing in line, I turned to speak to someone and my right knee buckled. Fortunately, my left leg is almost back to normal, so using 'figure skater reflexes' I was able to stay upright, otherwise I would have had to grab a complete stranger.
And he wasn't cute.
My knee made a really obvious 'snap' when it happened. People turned and stared.