Exclusion criteria
anterior knee pain, trauma, osteoarthritis, subluxation, rheumatic or neurologic disease, patellar tendinopathy, meniscal injury, patellar dislocation
OSTEOARTHRITIS
Participants will be excluded if they meet any of the following criteria: (i) self-reported anterior knee pain caused by trauma on the knee; (ii) self-reported history of patellar dislocation or subluxation; (iii) self-reported history of meniscal injury, ligament instability or patellar tendinopathy; (iv) history of osteoarthritis in any lower limb joint; (v) history of surgery on any lower limb joint; (vi) patient-reported rheumatic or neurologic disease; (vii) physiotherapy treatment for PFP during the preceding 6 months; (viii) answer “yes” on any questions on the PAR-Q physical activity readiness questionnaire [