Pain during prolonged sitting in subjects with patellofemoral pain in Dutch physical therapy clinics: an online questionnaire-based analysis

This study aimed to describe (1) differences between subjects with patellofemoral pain (PFP) with and without pain during prolonged sitting (PDPS), (2) minimum knee flexion angle and time to onset/disappearance of PDPS and (3) differences between those with PDPS at smaller/greater flexion angles and with fast/slow onset and disappearance of PDPS. Patient-reported online questionnaire. Private physical therapy clinics in the Netherlands between May 2021 and March 2023. 87 participants (61 (70%) females, mean age 22.0 years (IQR 4.0), body mass index 23.1 (4.7)). Visual Analogue Scale for worst pain (VAS-W) and sitting pain (VAS-W sitting), the Anterior Knee Pain Scale (AKPS), knee flexion angle to provoke PDPS and time to onset/disappearance of PDPS. 63 of 87 (72%) participants reported PDPS. Participants with PDPS experienced bilateral symptoms of PFP more frequently (71% vs 46%, p=0.44) and scored 12 points lower on the AKPS (p