Anterior knee pain (AKP) is very common in the general population, causing chronic disability, lost time from work, limitations in participating in sports, and a diminished quality of life. AKP represents one third or more of all complaints in a sports medicine clinic. In a study on participants from the U.S. Naval Academy, Boling et al. 1 found an AKP prevalence of 15% in females and 12% in males. They also observed that the annual incidence of AKP was 33 of 1000 people in female patients and 15 of 1000 people in male patients.