No prob. I’m also thinking there are different degrees of bone on bone. You can have damaged cartilage with some parts of the knee being bone on bone and other parts still having some cartilage remaining, or it can be all gone. He could’ve had damage to the medial meniscus that needed to be smoothed out, and depending on the extent of damage and nature of surgical repairs more or less could be gone. We just don’t know how bad his knee really is. We can assume his knee is, in the words of one of my orthopedic surgeons, “toast”, or we can assume it’s fine. We don’t know. We will see in just a few months. Meanwhile he’s certainly damaged goods even if we don’t know how badly damaged, so it’s prudent to plan and prepare for the worst while hoping for the best.