Iliotibial Band Syndrome (ITBS) — Lateral Knee Pain in Runners

What it is

The Lateral Knee Pain That Appears When Running

Iliotibial band syndrome (ITBS) — also called iliotibial band friction syndrome — is an overuse injury caused by the repeated friction of the iliotibial band over the lateral femoral epicondyle during flexion and extension of the knee while running.

The iliotibial band is a thick band of connective tissue that runs along the lateral aspect of the thigh, from the iliac crest to Gerdy's tubercle on the tibia. Its function is to stabilise the hip and the knee during walking and running.

The current theory suggests that the problem is not friction alone, but compression of innervated fatty tissue beneath the band during the stance phase of running, with the zone of maximum impingement at ~30° of knee flexion. Gluteus medius weakness is a causal factor that is frequently underestimated.

Runners are often the problem — not their knees. ITBS is rarely "recalcitrant" — the athlete who keeps running despite the pain is the one who never lets it heal.

Why Does ITBS Develop?

ITBS is multifactorial. Understanding the modifiable factors is essential for treatment and for preventing recurrence.

Training Factors

Rapid increase in running volume (the 10% rule)
Always running in the same direction on the track
Prolonged downhill running
Sudden change of training surface
Excessive weekly volume without gradual progression
Early return after a period of rest

Biomechanical Factors

Gluteus medius weakness — a major causal factor
Excessive foot pronation
Leg length discrepancy
Knee varus (genu varum)
Excessive tightness of the iliotibial band
Inadequate or worn footwear

Treatment Protocol

How Is ITBS Treated?

ITBS rarely requires surgery. A structured conservative approach, with identification and correction of the causal factors, resolves the great majority of cases.

Acute Phase — Reducing Inflammation

Relative rest (replacing running with swimming or cycling). Control of inflammation.

Temporary stop to running — do not "push through" the pain
Local cryotherapy: 15–20 min, 3–4×/day
Oral anti-inflammatories (NSAIDs) for a short course
Local corticosteroid in acute refractory cases

Rehabilitation Phase — Correcting the Cause

The critical step — and the most neglected. Physiotherapy targeting the gluteus medius and running biomechanics.

Strengthening of the gluteus medius (hip abductors)
Stretching of the iliotibial band and adjacent muscles
Foam roller for myofascial release (IT band + glutes)
Running analysis and correction of the biomechanical pattern

Progressive Return to Running

A gradual return with symptom monitoring. Rushing is the most common cause of relapse.

Start with short runs on a flat surface
Avoid downhills in the first weeks of return
Increase volume by a maximum of 10% per week
Alternate directions on the track and vary surfaces

Surgery — Exceptional Cases

Reserved for ITBS that is genuinely refractory to correctly applied conservative treatment over >6 months.

Arthroscopic resection of the inflamed tissue / bursa
Release of the iliotibial band (open or arthroscopic technique)
High success rate when the indication is correct

The Exercises That Matter Most

The 2024 systematic review (Frontiers in Sports) confirms it: strengthening of the hip abductors is the therapeutic factor with the greatest impact on ITBS. The foam roller and isolated stretching of the IT band have limited evidence.

Resisted Hip Abduction

Gluteus medius — the most important muscle. 3×15 repetitions with a resistance band or weight. The foundation of any ITBS programme.

Clamshell

Isolated activation of the gluteus medius in side-lying. Excellent for the early stages when load is limited by pain.

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Single-Leg Squat

Control of knee valgus. Functional strength of the gluteus medius under load. Progress to this once the acute pain has settled.

Foam Roller — Glutes and IT Band

Myofascial release. More effective on the glutes than directly on the IT band. 60–90 sec per area, 2–3×/week.

Ober Stretch

A specific stretch of the IT band in side-lying. One of the stretches with the best evidence for IT band tightness.

Running with Increased Cadence

Increasing cadence (~10%) reduces the lateral load on the knee. A simple technique with a significant biomechanical impact.

Prevention

How to Prevent Recurrence

ITBS has a high recurrence rate if the causal factors are not corrected. Prevention is more efficient than treatment.

Gradual progression

Never increase running volume by more than 10% per week.

Adequate footwear

Replace worn footwear. Gait analysis if there is excessive pronation.

Vary directions

Alternate direction on the track. Vary surfaces. Avoid excessive downhills.

Gluteus medius

Maintain strengthening of the abductors — even after the symptoms have resolved.

Training diary

Record volume, surface and symptoms. Identify patterns before a new injury.

Running cadence

Maintain an adequate cadence (~170–180 spm). Reduces lateral stress on the knee.

Questions about ITBS

In the acute phase, yes — continuing to run with pain aggravates the inflammation and prolongs recovery. Relative rest (replacing running with swimming or cycling) is essential. The return to running should be gradual, after the pain has resolved and gluteus medius strengthening has begun.

With correct treatment (rest + targeted physiotherapy), most people improve within 4–8 weeks. Cases with several months of symptoms may take longer. Recovery is faster when the gluteus medius is treated from the outset — not just the IT band.

The foam roller on the IT band has limited evidence — the iliotibial band is very dense tissue and does not "stretch" like a muscle. The foam roller on the glutes and the tensor fasciae latae is of more benefit. The most effective technique remains strengthening of the gluteus medius with targeted exercises.

Rarely — more than 90% of cases resolve without surgery. Surgery is considered only in refractory cases after 6 or more months of correctly applied conservative treatment, with structured physiotherapy and correction of the biomechanical factors.

Iliotibial Band Syndrome — Do I Have to Stop Running?