Patellofemoral pain syndrome (PFPS) is a common condition affecting up to 45% of teenagers and 33% of adults (Näslund, 2006). Patients range in age from their early teens into their eighties (Goodfellow et al., 1976, Saxena and Haddad, 2003). The defi nition of PFPS is controversial and sometimes very broad. It has been described as idiopathic pain arising from the anterior