Age 25, height 5feet 8inch, weight 54kg, I am a cross country runner for last 6 years. Recently my right knee is having problems. On the outer side of knee it pains while running and weight bearing. Got temporary relief with naproxen. X-ray was normal as told by general physician. But it is tender on deep pressure. Should I go for MRI? What's it is? Should I continue running . ?blood test are normal.