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M76.3 – Iliotibial Band Syndrome Explained
M76.3 is the ICD-10 code for iliotibial band syndrome, an overuse injury causing pain on the outer side of the knee. It is especially common in runners and cyclists.
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M76.3 is the ICD-10 code for iliotibial band syndrome, an overuse injury causing pain on the outer side of the knee. It is especially common in runners and cyclists.
Definition
M76.3 is the ICD-10 code for iliotibial band syndrome (ITBS), a common overuse injury affecting the iliotibial band – a thick strip of connective tissue running from the hip along the outer thigh to the outside of the shinbone (tibia). The condition involves irritation or inflammation where this band crosses the lateral femoral epicondyle (the bony prominence on the outer knee).
Causes
ITBS develops due to repetitive bending and straightening of the knee, causing friction of the iliotibial band over the lateral femoral epicondyle. Common contributing factors include:
- Long-distance running, especially downhill running
- Cycling with incorrect saddle height
- Sudden increases in training volume or intensity
- Muscle imbalances, particularly weakness of the hip abductors and gluteal muscles
- Biomechanical issues such as bowlegs or excessive foot pronation
- Inappropriate or worn-out footwear
Symptoms
The hallmark symptom is a sharp or burning pain on the outside of the knee that typically begins after a certain distance of running or cycling. Characteristic features include:
- Pain most intense at approximately 30 degrees of knee flexion (the so-called impingement zone)
- Worsening pain when running downhill or descending stairs
- Localised tenderness over the lateral femoral epicondyle
- Occasional mild swelling or warmth on the outer knee
- Pain relief at rest, returning quickly upon resuming activity
Diagnosis
The diagnosis is primarily clinical, based on history and physical examination. Key diagnostic tests include:
- Noble Compression Test: Applying pressure over the lateral femoral epicondyle at 30 degrees of knee flexion reproduces the characteristic pain.
- Ober Test: Assesses the flexibility and tightness of the iliotibial band.
Imaging such as ultrasound or MRI may be used to exclude other conditions such as meniscal tears or bursitis, particularly in unclear cases.
Treatment
Conservative Treatment
The vast majority of cases respond well to conservative management:
- Activity modification: Temporary reduction or cessation of the aggravating activity
- Physiotherapy: Stretching and releasing the iliotibial band, strengthening of hip abductors and gluteal muscles
- Foam rolling: Self-myofascial release to reduce tissue tension along the IT band
- Anti-inflammatory measures: Ice application and short-term use of nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen
- Gait analysis and footwear correction: Running technique adjustments and orthotic insoles if indicated
- Corticosteroid injections: For persistent inflammation unresponsive to initial treatment
Surgical Treatment
Surgery is rarely necessary and is only considered in chronic, treatment-resistant cases. The procedure typically involves a partial release of the iliotibial band at the level of the lateral femoral epicondyle.
Prevention
Preventive strategies include regular stretching of the iliotibial band, gradual progression of training load, appropriate footwear, and targeted strengthening of the hip-stabilising muscles.
References
- Ferber R, Noehren B, Hamill J, Davis IS. Competitive female runners with a history of iliotibial band syndrome demonstrate atypical hip and knee kinematics. Journal of Orthopaedic and Sports Physical Therapy, 2010;40(2):52-58.
- Fredericson M, Weir A. Practical management of iliotibial band friction syndrome in runners. Clinical Journal of Sport Medicine, 2006;16(3):261-268.
- World Health Organization (WHO): ICD-10 Version 2019, Code M76.3 – Iliotibial Band Syndrome. Available at: https://icd.who.int/
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