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Gracilis Tendon (Proximal)

The gracilis is a long, strap-like muscle of the medial thigh that extends from the pubis to the tibia. Its proximal tendon forms part of its origin at the pubic bone before blending into the muscular belly. Unlike its more clinically famous distal insertion at the pes anserinus, the proximal tendon is smaller and closely related to other adductor origins. It plays an important role in hip adduction and stabilization of the pelvis.

Synonyms

  • Proximal gracilis tendon

  • Tendinous origin of gracilis

  • Medial thigh proximal tendon

Origin and Course

  • Origin:

    • Proximal tendon arises from the inferior ramus of the pubis, near the pubic symphysis

  • Course:

    • The short proximal tendon blends quickly into the gracilis muscle belly

    • It lies superficial in the medial thigh, anterior to adductor magnus and brevis

  • Insertion (proximal focus):

    • Tendon serves as the fibrous anchor of gracilis to pubic bone before continuing as muscle belly

Relations

  • Anteriorly: Adductor longus tendon

  • Posteriorly: Adductor brevis and magnus

  • Laterally: Pectineus

  • Medially: Skin and superficial fascia of medial thigh

Nerve Supply

  • Obturator nerve (L2–L4), anterior division

Arterial Supply

  • Obturator artery

  • Medial circumflex femoral artery

  • Profunda femoris artery (muscular branches)

Venous Drainage

  • Obturator vein

  • Profunda femoris vein

  • Femoral vein

Function

  • Adduction of the thigh at the hip joint

  • Assists in flexion and medial rotation of the leg at the knee

  • Stabilization of pelvis during locomotion

Clinical Significance

  • Proximal tendon can be involved in avulsion injuries at the pubic origin in athletes

  • Contributes to groin strains and chronic medial thigh pain

  • Important in MRI evaluation of groin injuries

  • Must be distinguished from neighboring adductor tendons on imaging

MRI Appearance

T1-weighted images:

  • Tendon shows low signal intensity (dark)

  • Surrounded by bright fat planes at pubic origin

T2-weighted images:

  • Normal tendon: dark, low signal

  • Pathology (partial tear, tendinopathy): focal bright hyperintensity within tendon substance or at attachment

STIR (Short Tau Inversion Recovery):

  • Normal tendon: dark

  • Pathology (strain, enthesitis, tear): bright hyperintensity adjacent to bone or within tendon fibers

T1 Fat-Sat Post-Contrast:

  • Normal tendon: no or minimal enhancement

  • Pathology (inflammation, enthesopathy, tear): enhancing changes at attachment or within tendon substance

CT Appearance

Non-Contrast CT:

  • Tendon not directly visualized; seen as soft tissue density attached to pubic bone

  • Enthesophytes or calcifications may be identified at tendon origin

Post-Contrast CT:

  • Normal tendon: no enhancement

  • Pathology (inflammation, tumor, infection): enhancing soft tissue changes near pubic attachment

  • Avulsion injury: cortical irregularity with adjacent hematoma or swelling

MRI image

Gracilis Tendon (Proximal) MRI AXIAL anatomy image-img-00000-00000

MRI image

Gracilis Tendon (Proximal) MRI AXIAL anatomy image-img-1

CT image

Gracilis Tendon (Proximal) CT AXIAL IMAGE