Abstract
To test the hypothesis that, at 0° and 20° of knee flexion, patellofemoral contact area would be lower, while tibiofemoral rotation and patellofemoral malalignment would be higher in participants with patellofemoral pain (PFP) compared to pain-free participants. We hypothesized that no differences would be detected at 40° due to increasing patellar stability. Cross-sectional, descriptive study. Twenty-seven people with PFP and 29 pain-free people participated. Participants underwent magnetic resonance imaging at 0°, 20°, and 40° knee flexion with the limb in a simulated weight-bearing position. Patellofemoral contact area, tibiofemoral rotation angle, patellofemoral alignment (bisect offset index and patellar tilt angle) were quantified and compared between groups at each angle using Student's t-tests. An a-posteriori comparison was made between the pain-free group and a subgroup of 15 participants with patellofemoral pain who demonstrated a faulty lower limb movement pattern ("medial collapse"). In the patellofemoral pain group, contact area was lower at 0° (203.8±45.5 mm² vs. 224.1±46.6 mm², p=0.05) and 20° (276.8±56.2 mm² vs. 316.7±82.8 mm², p=0.02), bisect offset index (BOS) and patellar tilt angle (PTA) were higher at 0° (...Continue Reading
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