I have just developed mild arthritis in my left knee. At the moment it's just a gnawing ache and only flares up now and again. It doesn't seem to hurt when I'm moving at the moment. I've already got a bit of it in one wrists and two MCP joints, but it doesn't cause much trouble.
Anyway, to get to the point, does anyone else have arthritic knees, or know if running is going to damage them?