Methods
Screening for specific inclusion and exclusion criteria was performed
by 2 physicians. Only subjects with a diagnosis of unilateral
or bilateral PFP were included. The diagnosis of PFP was
based on symptom location (peripatellar and/or retropatellar) and
reproduction of pain with activities commonly associated with this
condition (eg, stair decent, squatting, kneeling, prolonged sitting).
Patients were screened by physical examination to rule out ligamentous
laxity, meniscal injury, pes anserine bursitis, iliotibial
band syndrome, and patella tendinitis. Patients who reported a
history of patella dislocation, patella fracture, knee surgery