Diacutaneous Fibrolysis and Patellofemoral Pain Syndrome

Inclusion Criteria: * Unilateral or bilateral patellofemoral pain longer than three months * Anterior or retropatellar pain of non-traumatic origin that is provoked by at least two of the following activities: prolonged sitting or kneeling, squatting, running, hopping, jumping, or stair ascending/descending. * The presence of pain on palpation of the patellar facets, on step down from 25 cm step, or during a double leg squat. * Pain over the previous week equal to or greater than 3 on a 10-cm visual analogue scale. * The presence of muscle shortening in rectus femoris or tensor fascia lata muscle length test and/or hypo-mobility or stiffness in the compartmental muscle play. Exclusion Criteria: * Previous knee surgery or traumatic lesions * Concomitant injury or pathology of other knee structures * History of patella subluxation or dislocation * Evidence of knee joint effusion * Pain in and/or referred from the hip or lumbar spine * Currently undergoing physiotherapy treatment for Patellofemoral pain syndrome or use anti-inflammatories or corticosteroid medication at the same time of the study. * Subjects unable or unwilling to give informed to written consent or fulfil questionnaires.