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http://www.runnersworld.com/tag/runners-knee

Runners knee is very dangerous if not treated right away. It is also very painful. Since running is a lot of repetition on the knees, its important to preserve them. If you have runners knee youll have to stop running so it doesn't get worse. The article is very good it talks about how to prevent the injury and how to treat it if its already happened to you. Most running injuries deal with overuse. this is why running form is so important. It helps you preserve your body for more miles with out running into an injury.