Patellofemoral knee pain or Anterior knee pain (AKP) is a common condition and is associated with pain around and under your patella (knee cap). Research has suggested that the primary theory in this condition, is mal-alignment and mal-tracking of the patella which can alter patellofemoral joint stress. It’s worth noting that this condition is generally insidious in onset and multifactorial, many causes can manifest as anterior knee pain.
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http://www.physiohaus.co.uk/blog/conservative-management-of-patellofemoral-knee-pain