 Study design: Prospective cohort study Methods: One hundred consecutive patients with the diagnosis of PFPS were included in the study. Factors including sex, age, body mass index BMI, Q angle, lateral patella displacement LPD, lateral patellofemoral angle LPA and pre-taping pain score were measured. One well-trained therapist applied adhesive tape to each patient by McConnell approach. Before and after taping, patients completed a visual analog pain scale VAS after performing a step-down from an 8-inch platform. Paired-t test was used for the difference of the VAS score measured before and after taping. Patients with improvement of more than 1 point in VAS score after taping were considered responsible, and others were non-responsible. The results were analyzed by logistic regression. 