I'm 50, always been active and fit. Several years ago I took up running and I love it. But now I have torn a cartilage and been offered arthroscopy to remove the offending bits. Does anyone have any experience of this? The surgeon felt that physio was unlikely to resolve the problem but I can't help worrying about someone messing about with my knee. He did say the scan showed very little wear & tear other than the cartilage damage. What do you think?