How do you look after a vintage car? You put it in a garage, cover it with a dustcover, drive it sparingly and slowly. And don't crash it.   Well, apart from not crashing, this is exactly the wrong way to look after an old joint  - present thinking is that you are much better off taking your old worn joints out for a spin to preserve them. And within reason, the brisker you walk, the better the outcomes.  In this episode I look at some recent research about osteoarthritis, that reinforces the old maxim, use it or lose it.   Here is a link to the website where you can find links to the research.