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[[File:Knee pain.jpg|right|thumb|400px|Knee pain is the most common injury for runners. This illustration shows the relationship between the kneecap and leg bones.]]
A pain behind the kneecap (Patellofemoral pain syndrome or PFPS) is one of the most problems for runners<ref name="RunningInjuries"/>. There is no well-established cure for this problem<ref name="PPConcepts"/>, but there are a number of things you can try and some treatments to avoid. ('''This article is under construction and incomplete!''')
=Causes=
There are a number of possible root causes of knee pain.