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Patellofemoral pain syndrome (PFPS)
Patellofemoral pain syndrome (PFPS), also known as patellar overload syndrome and runner's knee, is a condition characterized by knee pain ranging from severe to mild discomfort seemingly originating from the contact of the posterior surface of the patella (back of the kneecap) with the femur (thigh bone). It is "anterior knee pain involving the patella and retinaculum that excludes other intraarticular and peri-patellar pathology".
The population most at risk from PFPS are runners, cyclists, basketball players and other sports participants. Onset can be gradual or the result of a single incident and is often caused by a change in training regime that includes dramatic increases in training time, distance or intensity, it can be compounded by worn or the wrong type of footwear.
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