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M76.2 – Iliotibial Band Syndrome
M76.2 is the ICD-10 code for iliotibial band syndrome (ITBS), commonly called runner's knee. It describes a painful overuse condition on the outer side of the knee.
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M76.2 is the ICD-10 code for iliotibial band syndrome (ITBS), commonly called runner's knee. It describes a painful overuse condition on the outer side of the knee.
What is M76.2?
The ICD-10 code M76.2 refers to iliotibial band syndrome (ITBS), popularly known as runner's knee. It is an overuse injury affecting the outer side of the knee joint, most commonly seen in endurance athletes such as runners and cyclists.
Causes
The syndrome is caused by repetitive friction of the iliotibial band (IT band) – a thick strip of connective tissue running from the hip down to the shinbone – over the lateral femoral epicondyle (the bony prominence on the outer side of the knee). Common triggers include:
- Intensive running, especially downhill or on hard surfaces
- Sudden increases in training volume or intensity
- Muscular imbalances, particularly weak hip abductors
- Anatomical variations such as bow legs or leg length discrepancy
- Inappropriate or worn-out footwear
Symptoms
The hallmark symptom is a sharp or burning pain on the outer side of the knee, typically occurring during or after physical activity. Other symptoms may include:
- Pain when bending the knee between 20 and 30 degrees (the so-called impingement zone)
- Swelling or a warm sensation on the outer knee
- Increased pain when climbing stairs or walking downhill
- In advanced cases, pain at rest
Diagnosis
Diagnosis is typically clinical, based on a thorough medical history and physical examination. Common diagnostic tests include:
- Ober test: Assesses the flexibility and tension of the iliotibial band
- Noble compression test: Tenderness over the lateral epicondyle at 30 degrees of knee flexion
- Imaging studies such as ultrasound or MRI (magnetic resonance imaging) to rule out other conditions and assess associated damage
Treatment
Conservative Treatment
The majority of cases respond well to conservative management, which includes:
- Rest or activity modification: Avoiding pain-triggering activities
- Physiotherapy: Stretching and strengthening of the IT band, hip, and thigh muscles
- Foam rolling: Self-massage to release tension in the connective tissue
- Anti-inflammatory medications (NSAIDs such as ibuprofen) for pain relief
- Ice therapy (cryotherapy) to reduce local inflammation
- Running gait analysis, footwear assessment, and orthotic insoles if necessary
Advanced Treatment Options
For persistent symptoms, additional interventions may be considered:
- Corticosteroid injections to reduce local inflammation
- Extracorporeal shock wave therapy
- In rare cases, surgical release of the iliotibial band
Prognosis
With consistent treatment and appropriate adjustments to training habits, the prognosis is excellent. Most individuals recover fully within a few weeks to months.
References
- World Health Organization (WHO): ICD-10 Classification of Diseases – M76.2 Iliotibial band syndrome. Geneva, 2019.
- Lavine R. Iliotibial band friction syndrome. Current Reviews in Musculoskeletal Medicine. 2010;3(1-4):18-22. doi:10.1007/s12178-010-9061-8.
- Fredericson M, Wolf C. Iliotibial band syndrome in runners: innovations in treatment. Sports Medicine. 2005;35(5):451-459. doi:10.2165/00007256-200535050-00006.
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