IT band syndrome, also known as iliotibial band syndrome, is one of the most common injuries among runners. Highly debilitating, this inflammation can turn every stride into an ordeal, to the point of forcing a complete stop. Yet with a good understanding of the mechanisms involved and a few technical adjustments, it is entirely possible to avoid it.
What is IT band syndrome?
IT band syndrome is an inflammation of the tensor fasciae latae (TFL). The tendon in question connects the outer side of the hip to the upper part of the tibia. During running, with each flexion and extension of the knee, this tendon slides back and forth over the lateral condyle of the femur.
This back-and-forth movement resembles that of a windscreen wiper. If the friction becomes excessive, the tendon becomes irritated and a sharp pain appears on the outer side of the knee. This pain is often so intense that it ends up stopping the runner after only a few kilometres, even though it is completely absent at rest or when walking.
The main triggers
The factors that contribute to this inflammation are multiple and often result from an accumulation of errors:
- Too rapid a progression: Increasing your weekly mileage too quickly is the number one cause. The body does not have time to adapt its tendon resilience to the new workload.
- Inappropriate or worn-out kit: Running in ill-fitting trail or running shoes alters your foot strike. A collapsed midsole can accentuate internal knee rotation, increasing friction.
- Terrain: Routes that are too flat and monotonous (tarmac) or, conversely, excessively steep descents stress the tendon repetitively at the same angle of flexion.
- Muscular weakness: A lack of strength in the hip stabiliser muscles (notably the gluteus medius) allows the pelvis to tilt, putting the IT band under tension.
How do you prevent IT band syndrome?
To prevent this injury from taking hold, prevention must become a priority in your training routine.
Work on your gradual progression and your technique Don't change everything overnight. If you are moving from a heel-strike to a more natural footstrike, do it in stages. Also pay attention to the drop of your shoes: a radical change in heel height can alter the tension throughout the entire posterior and lateral chain.
Never neglect stretching Stretching is not just for recovery — it helps restore flexibility to the hip-glute-TFL complex. A supple tendon will create less friction than a tight, retracted one. Make a habit of doing specific running stretches to release the lateral chain.
Hydration: fuel for your tendons A tendon is made up primarily of water. Insufficient sports hydration makes the tissues less fluid and more fragile. Drink at least 1.5 litres of water a day, and more on training days. Conversely, alcohol increases acidity and promotes inflammation of the tendon sheaths.
Strengthen your stabilisers Incorporate lateral core exercises and glute strengthening. The more stable your pelvis, the less your knee will be subject to the parasitic "sweeping" movements, directly protecting your IT band.
What should you do if the pain is already there?
If the pain strikes, don't try to push through it. Apply ice to the painful area for 15 minutes several times a day to reduce inflammation. During the rest phase, you can maintain your cardio with low-impact activities such as cycling or swimming. Finally, if the problem persists, consider seeing a sports podiatrist to check whether orthotic insoles are needed to correct your foot alignment.
The self-test: is it really IT band syndrome?
To confirm that it is indeed IT band inflammation rather than a meniscal issue, you can perform the side-step test (or Noble test). Stand upright, bearing weight on the painful leg, and slowly bend the knee to approximately 30 degrees. It is precisely at this angle that the tendon rubs most strongly against the bone. If a sharp, localised pain appears on the outer side of the knee at that moment, an IT band syndrome diagnosis is highly likely. This test is an excellent indicator for knowing when it is time to ease off before the inflammation becomes chronic.
