I got an MRI for my right knee this evening. I'll get the word from my doctor Friday morning.
My knee is definitely stronger this time around than last--it can hold me up without pain to do push-ups. So I'm thinking partial tear, maybe.
Meanwhile, I'll try out the elliptical machine at the gym at work tomorrow. And a low-key martial arts class Friday. Sensei said he would give me a workout that kept my knee safe.