After MRI scan, consultant says I've got some bits of cartilidge to remove from knee and has discovered old tear in a.c.ligament. Now going to do an arthroscopy to sort things out in two weeks time (got a cancellation). He seemed optimistic about getting back to hills again. Any thoughts from anyone about getting back to fell running after this op? Had arthroscopy on other knee 25 years ago and don't remember what I did after that!