DECLINE-STEP DOWN TEST FOR PFPS On of the hallmark symptoms of patients with PFPS is anterior knee pain while descending stairs. In other videos on Facebook we have discussed diagnostic test clusters for the condition that have been shown to have little to know value. To evaluate treatment effects different patient related outcome measures such as the anterior knee pain scale have been described but they may not reflect disability of all patient populations. Therefore Ophey et al (2019) wanted t