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Medial intercondylar tubercle

The medial intercondylar tubercle of the tibia is a bony prominence forming the medial part of the intercondylar eminence on the tibial plateau. It lies between the articular surfaces of the medial and lateral condyles and serves as an important attachment site for ligaments that stabilize the knee. This structure is essential in knee biomechanics, providing anchorage for cruciate ligaments and meniscal horns.

It is often assessed in imaging studies of knee trauma, ligamentous injury, and degenerative disease, and can be involved in avulsion fractures or post-traumatic bone changes.

Synonyms

  • Medial tibial spine

  • Medial tibial intercondylar eminence

  • Medial intercondylar spine of tibia

Muscular Attachments

  • The medial intercondylar tubercle does not serve as a direct muscular attachment site but anchors critical soft tissue structures:

    • Anterior cruciate ligament (ACL): attaches anterior to the tubercle

    • Posterior cruciate ligament (PCL): attaches posterior to the tubercle

    • Medial meniscus: anterior and posterior horns attach adjacent to the tubercle

Relations

  • Anteriorly: Anterior intercondylar area of tibia, ACL attachment

  • Posteriorly: Posterior intercondylar area, PCL attachment

  • Medially: Medial tibial condyle articular surface

  • Laterally: Lateral intercondylar tubercle (lateral tibial spine)

  • Superiorly: Related to femoral condyles during articulation

  • Inferiorly: Continuous with proximal tibial metaphysis

Function

  • Provides strong anchorage for cruciate ligaments and meniscal horns

  • Contributes to stability of the knee joint by resisting anterior and posterior translation of the femur on tibia

  • Acts as a bony landmark in knee arthroscopy and imaging

Clinical Significance

  • Avulsion fractures: Common in association with ACL injuries

  • Osteophytes: May develop in osteoarthritis, impinging on knee motion

  • Meniscal root tears: Often related to its attachment sites

  • Surgical relevance: Landmark in ligament reconstruction and arthroscopic procedures

MRI Appearance

T1-weighted images:

  • Bone marrow shows intermediate to bright signal

  • Cortical bone appears dark (low signal)

T2-weighted images:

  • Bone marrow shows intermediate to bright signal

  • Cortical margins remain dark

STIR (Short Tau Inversion Recovery):

  • Marrow signal is low in normal state

  • Pathology (bone edema, fracture, contusion) shows bright hyperintensity

Proton Density Fat-Saturated (PD FS):

  • Normal marrow signal is low

  • Abnormal marrow (edema, contusion, inflammation) appears bright hyperintense

Proton Density (PD):

  • Marrow appears intermediate to bright

  • Cortical outline remains dark

T1 Fat-Sat Post-Contrast:

  • Normal bone marrow enhances mildly and uniformly

  • Pathology (inflammation, neoplasm, osteomyelitis) may show heterogeneous or focal enhancement

CT Appearance

Non-Contrast CT:

  • Medial intercondylar tubercle appears as a sharp bony projection of the tibial spine

  • Cortical bone seen as high density; trabecular bone as lower density

  • Avulsion fractures, osteophytes, or sclerosis clearly detected

Post-Contrast CT:

  • Bone itself does not enhance

  • Enhancement may be seen in surrounding soft tissues if there is associated inflammation, tumor, or synovitis

CT VRT 3D image

medial intercondylar eminence 3d image

MRI image

Medial intercondylar tubercle anatomy 3t mri

MRI image

Medial intercondylar tubercle of tibia coronal cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

CT images

Medial intercondylar tubercle of tibia ct coronal image

CT images

Medial intercondylar tubercle of tibia ct sag