Tensor Fascia Lata

Courtesy: Prof Nabil Ebraheim, University of Toledo, Ohio, USA

ANATOMY

• The tensor fascia lata is a small, flat muscle located in the anterolateral aspect of the upper thigh.

• It lies between:

  • The gluteus maximus posteriorly

  • The fascia lata and iliotibial tract laterally

• It blends distally with the iliotibial band, contributing to lateral thigh stability.

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ORIGIN

• Arises from the anterior part of the outer lip of the iliac crest.

• Also takes origin from the anterior superior iliac spine.

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INSERTION

• Inserts into the iliotibial band.

• The iliotibial band extends from the iliac crest to the lateral condyle of the tibia, where it attaches at Gerdy tubercle.

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FASCIAL ANATOMY

• The iliotibial band is a thickened lateral band of fascia.

• It runs along the lateral thigh from the iliac crest to the knee.

• It plays a key role in lateral knee and hip stability.

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INNERVATION

• Supplied by the superior gluteal nerve.

• The nerve exits the pelvis through the greater sciatic foramen above the piriformis muscle.

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FUNCTION

• Assists in hip flexion.

• Assists in hip abduction.

• Contributes to internal rotation of the thigh.

• Helps stabilize the pelvis during single-leg stance.

• Counteracts the posterior pull of the gluteus maximus on the iliotibial band.

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ASSOCIATED CLINICAL CONDITIONS

1. Snapping Hip Syndrome (External Type)

• Caused by the iliotibial band sliding over the greater trochanter.

• Produces an audible or palpable snapping sensation.

• Often painful during hip motion.

Clinical Examination

• Patient lies in the lateral position.

• Hip is placed in extension and rotated.

• Examiner slowly abducts the leg with the knee flexed.

• Tight iliotibial band results in:

  • Limited abduction

  • Reproducible snapping sensation

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2. Trochanteric Bursitis

• Results from repetitive friction, trauma, or irritation of the iliotibial band over the greater trochanter.

• Leads to inflammation of the trochanteric bursa.

• Patients typically localize pain directly over the lateral aspect of the hip.

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3. Iliotibial Band Syndrome (Runner’s Injury)

• Commonly seen in long-distance runners.

• Caused by repetitive friction between the iliotibial band and the lateral femoral condyle.

• Presents with lateral knee pain during activity.

Treatment

• Activity modification

• Physical therapy

• Local injection therapy

• Surgical intervention in refractory cases

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4. Thigh Compartment Syndrome

Surgical Approaches Involving Tensor Fascia Lata

Watson–Jones Approach

• Interval between:

  • Tensor fascia lata

  • Gluteus medius

• Both muscles are supplied by the superior gluteal nerve.

Smith–Petersen Approach

• Interval between:

  • Tensor fascia lata (superior gluteal nerve)

  • Sartorius muscle (femoral nerve)

• Care must be taken to protect the lateral femoral cutaneous nerve of the thigh.

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CLINICAL RELEVANCE

• The tensor fascia lata plays a critical role in hip biomechanics and lateral thigh stability.

• Dysfunction can contribute to:

  • Hip pain

  • Knee pain

  • Gait abnormalities

• It is an important landmark in orthopaedic surgical approaches to the hip and thigh.