For me exercise eliminates knee pain. I have also had meniscus issues in one knee for at least 6 years now after a particularly hard training session at my dojo in Los Angeles. I kept walking the dog after the injury, but didn't go back to karate for a good week. I did resume my training after a week and my knee felt better in 3 weeks. Now, oddly, my medial meniscus becomes inflamed only if I stop exercising for more than a week. When it does, I know I need to get back to exercising asap. Overnight the pain and inflammation diminishes to almost nothing. It's very peculiar thing.