Good luck to your son, Gutmutter. I had both of my knees redone because of old sports injuries. It's real easy to overdue it, especially the first day or two. I left the hospital, not using the crutches I was given and attended my daughters basketball game that night. I had no pain for the first 24 hours but really paid for it after that. Hopefully he takes it easy and is smarter than this old lady was.