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Pubic tubercle

The pubic tubercle is a prominent bony projection located on the superior surface of the medial part of the pubic bone. It serves as an important palpable surface landmark in the anterior pelvis and provides attachment to key structures of the groin. It plays a vital role in surgical orientation, hernia classification, and radiologic identification of the inguinal region.

Synonyms

  • Tuberculum pubicum

  • Anterior pubic projection

  • Pubic bone prominence

Location and Attachments

  • Location:

    • Situated on the superior pubic ramus, lateral to the pubic symphysis

    • Lies anteriorly at the medial end of the inguinal ligament

  • Attachments:

    • Inguinal ligament attaches to the pubic tubercle

    • Contributes to the medial boundary of the superficial inguinal ring

    • Attachment site for some fibers of the rectus abdominis and external oblique aponeurosis

Relations

  • Anteriorly: Subcutaneous tissue and skin of the groin

  • Posteriorly: Urinary bladder (in deep pelvic relation)

  • Superiorly: Inguinal ligament fibers and anterior abdominal wall muscles

  • Inferiorly: Pubic crest and pubic symphysis

Function

  • Serves as a bony anchor for the inguinal ligament

  • Acts as a landmark to differentiate inguinal vs femoral hernias (inguinal hernia above and medial; femoral hernia below and lateral)

  • Provides surface anatomy reference in surgical incisions and radiologic imaging

  • Forms part of the boundary of the superficial inguinal ring

Clinical Significance

  • Palpable landmark used in hernia diagnosis and surgical repair

  • Important in differentiating inguinal from femoral hernias

  • Serves as a key point in orientation for groin surgeries and imaging

  • May be involved in osteitis pubis or trauma to the anterior pelvis

  • Used in radiology as a bony landmark for assessing pubic symphysis and groin structures

MRI Appearance

T1-weighted images:

  • Pubic tubercle shows very low signal intensity (dark) due to cortical bone

  • Adjacent fatty tissues appear bright, helping define its margins

T2-weighted images:

  • Cortical bone remains very low signal intensity

  • Marrow spaces (if imaged near pubic body) may show intermediate to bright signal

  • Pathology (edema, fracture) may show focal bright signal in adjacent bone marrow

STIR (Short Tau Inversion Recovery):

  • Cortical bone remains dark

  • Bone marrow edema or inflammation adjacent to pubic tubercle shows bright hyperintensity

T1 Fat-Sat Post-Contrast:

  • Cortical bone does not enhance

  • Adjacent soft tissue inflammation, infection, or tumor may enhance

  • Marrow pathology may show contrast uptake if present

CT Appearance

Non-Contrast CT:

  • Pubic tubercle appears as a dense bony prominence with high attenuation

  • Fractures are seen as cortical disruption or irregularity

  • Chronic changes may show bony sclerosis or spurring

Post-Contrast CT:

  • No intrinsic enhancement of bone

  • Adjacent soft tissue abnormalities (infection, hematoma, tumor) may show enhancement

  • Useful for evaluating fractures, bone tumors, or pelvic inflammatory processes

MRI image

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MRI image

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MRI image

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CT image

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