Revisiting the Role of Iliotibial Band

For decades, the iliotibial band (ITB) was treated as a simple, passive cord of tissue running down the outside of the thigh. Recent studies have overturned that picture almost completely, and the new understanding is reshaping how clinicians assess, prevent, and treat lateral hip and knee problems in athletes.

From a Passive Cord to a "Complex, Versatile" Structure

A widely cited narrative review in Sports Medicine by Hutchinson and colleagues reframed the ITB as a distinctly human structure whose mechanical behaviour is still debated rather than a simple static band.

Far from being inert, the band works in series with the gluteal and tensor fasciae latae (TFL) musculature, meaning its tension and length are actively modulated by the muscles attached to it rather than being fixed. Authors specifically call for more research into this dynamic muscle-fascia relationship to explain why some athletes develop iliotibial band syndrome (ITBS) while others with similar training loads do not.

This matters clinically because it shifts the question from "is the band too tight?" to "is the neuromuscular system controlling the band working correctly?" — a far more actionable framing for rehabilitation.

A Paradigm Shift

The textbook explanation of ITBS says friction of the band sliding back and forth over the lateral femoral epicondyle, which has been increasingly challenged. A 2024 systematic review in Frontiers in Sports and Active Living notes that contemporary theory instead points to impingement of the ITB against the lateral femoral epicondyle, driven by altered muscle activation, hip abductor weakness, and reduced proprioception, rather than simple repetitive sliding friction. Imaging work cited in this literature has even questioned whether the distal band moves over the epicondyle at all in the way older models assumed.

This reconceptualisation explains why interventions that only stretch or "loosen" the band (foam rolling, static ITB stretches) have shown limited and inconsistent benefit, while interventions that improve neuromuscular control of the hip have shown more consistent results.

The same 2024 systematic review pooled findings from runners with ITBS and found that hip abductor strengthening (HAS) has emerged as the most consistent component of effective conservative care, appearing in the majority of successful treatment protocols. Programs combining HAS with manual therapy, shockwave therapy, or gait retraining produced larger and more reliable improvements in pain and function than any single intervention alone, with multi-planar abductor strengthening protocols showing particular promise over traditional single-plane exercises.

Gait retraining, like addressing step rate, foot-strike pattern, or hip mechanics during running itself, is emerging as a promising newer strategy, though the authors concluded that the evidence base for it remains thin and needs larger, higher-quality trials.

Beyond the Runner's Knee

Modern sports medicine is also finding new relevance for the ITB outside classic overuse running injuries:

● Curve running biomechanics: A 2025 biomechanical modelling study found that running around a curve, relevant to track athletes and field-sport cutting movements, measurably changes ITB strain patterns compared to running in a straight line, suggesting that track structure itself may be an injury-risk variable worth exploring.

● Knee osteoarthritis surgery: A 2025 retrospective study found that surgical release of the ITB meaningfully improved pain, function, and quality of life in patients with isolated patellofemoral osteoarthritis, pointing to a therapeutic role for the band well beyond youth athletic overuse injuries.

Takeaways:

· ITB should no longer be treated, taught, or rehabilitated as a static, rope-like structure that simply needs to be "released".

· It is a dynamic, muscularly-controlled tensioning system that contributes to hip and knee stability across running, cutting, and loading tasks. For clinicians, that means assessment should look up to hip abductor strength and motor control rather than only at the band itself, and rehabilitation protocols should prioritise multi-planar strengthening and movement retraining over passive stretching alone.

· Further high-impact studies should be conducted to explore the area for more valuable evidence.