Iliotibial Band Syndrome

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Anatomy

The ITB is a continuation of the tendinous part of the tensor fascia lata, and has some contribution from fibres of the gluteal muscles. It it connected to the linea aspera via the intermuscular septum just proximal to the lateral epicondyle of the femur. Distally it spans out and inserts on the lateral border of the patella, the lateral retinaculum, and Gerdy's tubercle. Between the superior aspect of the lateral femoral epicondyle and Gerdy's tubercle there is no bony attachment.

Epidemiology

ITBS is common in athletes, and the most common cause of lateral knee pain in this population.

Pathophysiology

ITBS is caused by excessive friction of the distal ITB and/or its associated bursa as it glides over the lateral femoral epicondyle with repeated flexion-extension cycles of the knee.

Clinical Features

History

Iliotibial band syndrome usually presents at pain over the lateral aspect of the knee, but occasionally can become irritated proximally and present as hip pain. In the lateral knee the pain is usually located over the lateral femoral epicondyle, but this may radiate distally to Gerdy's tubercle, or proximally to the tensor fascia lata.

Common aggravating activities are those that involve repetitive flexion and extension cycles of the knee such as running and cycling, and the pain usually starts within several minutes. There is often aggravation with activity on inclined surfaces such as downhill running. The posterior fibres of the ITB are in contact with the lateral femoral epicondyle at approximately 20° to 30° of knee flexion, and during downhill running there is a reduced knee flexion angle upon foot strike, leading to the ITB fibres being in more frequent contact with the lateral femoral epicondyle. ITBS is less common in sprinters because their knees have a higher degree of flexion at foot strike.

The pain is usually diffuse initially over the whole lateral knee. The pain usually eventually localises to an area 2 to 4cm proximal to the lateral joint line.

Pain can eventually become constant even at rest with continued aggravation.

Examination

In some cases the patient may have a stiff-legged gait due to avoidance of knee flexion.

There is tenderness over the lateral femoral epicondyle.

Pain can be provoked by single-leg stance with knee flexion to 30°

There may be tightness with the Ober test.

Look for biomechanical variations. There may be a leg length discrepancy with ITBS occurring in the shorter leg. Forefoot varus and high knee Q angles are also associated features.

Imaging

Typical MRI findings are ITB thickening, and fluid collection deep to the ITB

Differential Diagnosis

Differential Diagnosis of Lateral Knee Pain

• Lateral meniscus tear
• Posterolateral corner injury
• Patellar dislocation or subluxation
• Lateral collateral ligament tear
• Iliotibial Band Syndrome
• Osteoarthritis exacerbation
• Osteochondral lesion lateral femoral condyle
• Popliteus Tendinopathy
• Biceps Femoris Tendinoapthy
• Semimembranosus Tendinopathy/bursitis
• Fibula head fracture
• Proximal Tibiofibular Joint Instability
• Snapping Biceps Femoris and Popliteus Tendons
• Peroneal Nerve Compression/Neuritis

Treatment

In the acute phase provocative activities should be avoided.

Corticosteroid injections can be used to reduce inflammation, and is usually injected where the ITB crosses the lateral femoral condyle. The addition of local anaesthetic can provide diagnostic value.

Stretching is often recommended once the acute inflammation has settled.

In the subacute phase biomechanical abnormalities should be addressed. Assess for tightness in the ITB, hamstring, gluteal, and adductor muscles. S

Strengthening is recommended after range of motion has improved. Here the hip abductors are focused on.

Surgery is very uncommon. Approaches involve resection and incisions of the ITB to reduce tension and minimise bony contact.