Static and Dynamic Ultrasound Imaging of the Iliotibial Band/Fascia Lata: Brief Review of Current Literature and Gaps in Knowledge

Purpose of the Review: The physiopathology of iliotibial band syndrome (ITBS) remains obscure and ultrasound (US) imaging could be a low-cost modality improving our understanding of this condition as well as its diagnosis and management. This brief review synthesizes the up-to-date knowledge on static and dynamic US imaging measurements of the fascia lata and iliotibial band (ITB) in both asymptomatic individuals and patients with ITBS. Recent Findings: Mean ITB thickness values for asymptomatic individuals ranged from 1.10 to 1.95 mm. Only three studies with very small sample size focused on ITBS patients and no quantitative data were reported. All dynamic US imaging studies involved asymptomatic participants. One study demonstrated a lateral movement of the ITB relative to the femoral condyle and a group of investigators showed 3D displacement of the fascia lata. No study could be found on ITB loose connective tissue measurements. Summary: This review clearly indicates a paucity of research in the field of static and dynamic US measures. Measuring the loose connective tissue that lies between the deep fascia layers could be an interesting target to help our understanding of ITBS and improve care for the patients.