Dear All.
Sorry if this type of question has been asked before but any info / advice would be kindly received.
Two years ago I went on my first ever ski trip. To cut a long story short I ended up hurting my knee very badly and was out of running for ½ year.
Now the knee seems to be ok until I try to run any thing much more than 15 miles . I get a really bad pain in the back of it which disappears when I stop running. It’s odd, last summer I did a 26 mile hike and the knee was totally fine.
Not sure if it’s a strength thing and I need to build my distance up slowly or if it’s an issue that will never go away.
Any one had anything similar? Is a visit to the Docs my only answer?

Cheers again for any info.
Tim