 This project will conduct a randomised clinical trial to evaluate the relative benefits of orthotics as the sole treatment of patellofemoral pain syndrome and also when combined with physiotherapy. Factors associated with predicting the results of orthotic therapy will be studied to see if there are any tests that a health care practitioner can perform to provide information early on in a consultation regarding possible treatment outcomes. A cost-benefit analysis will also be conducted to calculate the relative economic merits of the treatments. 