Patellofemoral pain is pain associated with the joint between the kneecap, known as the patella, and the thigh bone, or femur. It commonly affects activities involving repeated knee bending or increased joint load, including squatting, running and using stairs. Patellofemoral pain affects more than 20% of adolescents and adults. It is also thought to precede patellofemoral osteoarthritis, which affects more than half of people with knee pain or osteoarthritis (Hart et al., 20