"Some of us just don't agree with his usage to date."

The problem with the word "usage" is that it ignores whatever pain and resulting limitations he has as if he was a player on a Madden video game. It also assumes that his arthritic knee is permanent and stationary-meaning it won't get better and it won't get worse ! But his knee is Not stable-that's what arthritis is all about. My arthritic should is getting worse and worse the more I'm in this post. Tomorrow it could be fine and I'll go out surfing. Then again I may be in the ER begging the doc for an epidural shot in the joint. Who knows ? And that is the point.