Clinical Research Directory

Inclusion Criteria Men and women aged 18-40 years old that can give informed written consent. Clinical diagnosis of unilateral or bilateral PFP longer than 3 months (exemplified in the following sections). Anterior or retropatellar pain reported on at least two of the following activities: prolonged sitting, ascending or descending stairs, running, kneeling and hopping/jumping. At least two of the three following clinical examination findings: * Pain during resisted isometric quadriceps contraction * Pain with palpation of the posterior borders of the patella * Pain during squatting Classified as a subgroup of PFP. Exclusion Criteria Individuals who are not part of a PFP group Previous knee surgery and participants awaiting surgery for another lower limb joint problems Ligamentous instability and/or internal pathology History of patella subluxation or dislocation Joint effusion when the midpatellar girth is 5% or more than the non-involved knee True knee joint locking and/or giving way Coexistent acute illness or chronic disease Bursitis, patella or iliotibial tract tendinopathy, Osgood-Schlatter's disease, Sinding-Larsen-Johansson Syndrome, muscle tears or symptomatic knee plicae Pregnancy or breast feeding