Changes in daily sedentary time, in adolescents with long-standing knee pain, during a management strategy including activity modification: An ancillary analysis of two clinical trials.

Objectives: The aim was to investigate changes in sedentary time during an activity modification strategy for sports-active adolescents with patellofemoral pain (PFP) and Osgood-Schlatter (OSD).

Design: Explorative ancillary analysis of two different prospective clinical trials with two different endpoint timelines.

Methods: 202 adolescents with either PFP or OSD were included.