Feedback Leads to Better Exercise Quality in Adolescents with Patellofemoral Pain.

Purpose: Adolescents with patellofemoral pain (PFP) do not comply with their exercise prescription, performing too few and too fast repetitions, compromising recovery. We investigated if real-time feedback on contraction time would improve the ability of adolescents with PFP to perform exercises as prescribed. Methods: A randomised, controlled, participant-blinded, superiority trial with a 6-week intervention of three weekly sessions of three elastic band exercises was undertaken. Forty 15 to 19-year-old adolescents with PFP were randomised to real-time BandCizer(TM)-iPad feedback on contraction time or not by a physiotherapist. The primary outcome was the mean deviation from the prescribed contraction time of 8 seconds per repetition. Secondary outcomes included isometric hip and knee strength, Kujala Patellofemoral Scale and Global Rating of Change. Results: The mean deviation from prescribed 8 seconds per repetition contraction time was 1.5s (+/-0.5) for the feedback group, compared to 4.3s (+/-1.0) for the control group (mean difference: 2.7s (95% CI: 2.2-3.2, P

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