It isn't the first time I have seen studies like that but I thought I would share it here anyway, basically it says that doing high impact exercises is actually good for your knees. Researchers in Australia who did a study
"found that people who exercised vigorously had thicker and healthier knee cartilage than their sedentary peers. That suggests the exercisers may have also enjoyed a lower risk of osteoarthritis, which is caused by breakdown and loss of cartilage."It goes on to discuss some other injuries like stress fractures and soft tissue damage, but the main point is arthritis is caused by genetics and obesity. Running will not ruin your knees and is actually GOOD for for it!
I was supposed to work yesterday but ended up getting overstaffed...oh darn. So I went for a run instead. Yay
SO don't worry about your knee joints as you run today you are actually making them healthier! In case you cannnot see it, I am sticking my tongue out at all the running naysayers!