I run 70 - 80k a week and sometimes get soreness at the top of the kneecap. When the soreness develops it is usually due to either laziness, in that I don't do enough stretching (stretch the IT band), or my shoes are worn out - usually the shoes! It is pretty predictable that once the shoes have 1000k in them the soreness will start. Replace the shoes and the soreness will be gone inside of 2 weeks (without rest).
Although I believe the shoes are the major contributor don't underestimate the stretching.
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