Epidemiology
Patellofemoral pain syndrome is one of the most common disorders of the knee, accounting for 25% of knee injuries seen in the sports medicine clinic.[1] It is most common in the second and third decade of life. In one study of athletic patients over a 7-year period in the US, 7.4% of all male injuries (and 18.1% of knee injuries) and 19.6% of all female injuries (and 33.2% of knee injuries) were diagnosed as patellofemoral pain syndrome.[2] In a Canadian study of patients with running-related injuries, the most common complaint was patellofemoral pain (16.5%), and, of these, 38% were men and 62% were women.[3]
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