Topics

Topic

design image
Tensor fasciae latae muscle

The tensor fasciae latae (TFL) is a small, fusiform muscle located on the lateral aspect of the thigh. It arises from the iliac crest and inserts into the iliotibial tract, contributing to stabilization of the hip and knee. The TFL works in synergy with the gluteus medius and minimus, acting as an important hip abductor, medial rotator, and pelvic stabilizer. Clinically, it is relevant in overuse injuries, hip biomechanics, and as a landmark in lateral surgical approaches.

Synonyms

  • TFL muscle

  • Tensor of the fascia lata

  • Iliotibial band tensor

Origin, Course, and Insertion

  • Origin:

    • Anterior part of the outer lip of the iliac crest

    • Anterior superior iliac spine (ASIS)

    • Deep surface of fascia lata

  • Course:

    • Fibers run vertically downward and slightly posterior along the lateral thigh

    • Lies anterior to the gluteus medius and superficial to the vastus lateralis

    • Its muscle belly is short and thick, blending into the iliotibial tract

  • Insertion:

    • Inserts into the iliotibial tract, which continues distally to the lateral condyle of the tibia (Gerdy’s tubercle)

Relations

  • Anteriorly: Subcutaneous tissue of lateral thigh

  • Posteriorly: Gluteus medius and gluteus minimus

  • Medially: Sartorius and rectus femoris

  • Laterally: Iliotibial tract

Nerve Supply

  • Superior gluteal nerve (L4–S1)

Arterial Supply

  • Lateral circumflex femoral artery (ascending branch)

  • Superior gluteal artery

Venous Drainage

  • Drains into the lateral circumflex femoral vein and superior gluteal vein, then into the femoral vein

Function

  • Abduction of the thigh at the hip joint

  • Medial rotation of the thigh

  • Assists in flexion of the thigh

  • Stabilizes the pelvis during walking and running

  • Tightens the fascia lata and contributes to lateral knee stabilization via the iliotibial tract

Clinical Significance

  • Frequently involved in overuse syndromes such as iliotibial band friction syndrome

  • Can contribute to lateral hip pain and snapping hip syndrome

  • Landmark in surgical procedures involving the lateral thigh and hip

  • Used as a surgical flap in reconstructive procedures

MRI Appearance

T1-weighted images:

  • Muscle shows low-to-intermediate signal intensity

  • Fatty infiltration may appear bright

  • Chronic atrophy shows diffuse bright areas

T2-weighted images:

  • Muscle demonstrates low-to-intermediate signal intensity

  • Injury, edema, or inflammation appears bright

STIR (Short Tau Inversion Recovery):

  • Normal muscle has low-to-intermediate signal

  • Strain, inflammation, or myositis appear as bright signal intensity

Proton Density Fat-Sat (PD FS):

  • Normal muscle has low-to-intermediate signal

  • Pathology demonstrates bright signal areas indicating edema or tear

T1 Fat-Sat Post-Contrast:

  • Normal muscle enhances mildly and uniformly

  • Pathological muscle shows heterogeneous enhancement or rim enhancement with abscess

CT Appearance

Non-Contrast CT:

  • Appears as homogeneous soft tissue density on the lateral thigh

  • Hematoma shows as a hyperdense region

  • Fatty degeneration appears as areas of low attenuation

Post-Contrast CT:

  • Normal muscle enhances mildly and evenly

  • Inflammation or neoplasm enhances more intensely and irregularly

  • Abscess appears as central low density with rim enhancement

CT image

Tensor fasciae latae muscle CORONAL

CT image

Tensor fasciae latae muscle CT axial anatomy image-img-00000-00000

CT image

Tensor fasciae latae muscle CT axial anatomy image-img-00000-00000_00001

CT image

Tensor fasciae latae muscle CT axial anatomy image-img-00000-00000_00002

CT image

Tensor fasciae latae muscle