When the doc told me about this procedure for the first time a couple of years ago, the first thing he said was, "Do you remember vectors from your high school or college math class?"
Obviously I was hooked.
The short explanation is that this procedure is designed to change the direction of the force onto the knee. Instead of the kneecap pushing hard directly on my knee (and my bad cartilage), it will push in a higher spot.
So I'll be out a week and a half (and blogging more, probably). Last year I went to all online sub plans and am loving it. It's great, especially for those unplanned absences. No more running into school sick early in the morning to write a quick scribble for my sub. I just send her (and our secretary) the link. I've got all seating charts and working documents I use synced in Google Drive so if I change the seat of a student that change is automatically in my plans.
Check them out HERE. That's pretty cool too I'd say.