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Medial talocalcaneal ligament

The medial talocalcaneal ligament (MTCL) is a component of the deep layer of the deltoid ligament complex of the ankle. It connects the medial tubercle of the posterior talus to the sustentaculum tali of the calcaneus, providing reinforcement to the medial ankle joint.

It plays a crucial role in ankle stability, resisting eversion and external rotation forces. Injury to this ligament is uncommon in isolation but may occur in severe ankle sprains, deltoid ligament complex injuries, or in association with posterior tibial tendon dysfunction.

Synonyms

  • Deep talocalcaneal ligament

Origin, Course, and Insertion

  • Origin: Medial tubercle of the posterior talus

  • Course: Runs obliquely downward and backward from talus to calcaneus

  • Insertion: Sustentaculum tali of the calcaneus

Relations

  • Superiorly: Posteromedial talus and posterior tibial tendon sheath

  • Inferiorly: Sustentaculum tali and subtalar joint capsule

  • Anteriorly: Tibionavicular ligament (part of deltoid complex)

  • Posteriorly: Posterior tibiotalar ligament

  • Laterally: Subtalar joint cavity

Function

  • Stability: Reinforces the medial side of the subtalar and talocrural joints

  • Restriction of motion: Limits excessive eversion and external rotation of the hindfoot

  • Support: Works with the rest of the deltoid ligament complex to maintain medial ankle stability during gait

  • Load sharing: Distributes stress between talus and calcaneus in weight-bearing

Clinical Significance

  • Injuries: MTCL injury usually occurs with high-energy trauma or as part of combined deltoid ligament tears

  • Association: Often linked to ankle fractures, subtalar dislocations, and posterior tibial tendon insufficiency

  • Symptoms: Medial ankle pain, swelling, instability, and difficulty with eversion

  • Chronic deficiency: May contribute to progressive flatfoot deformity and ankle arthritis

  • Imaging relevance: MRI is key for identifying MTCL injury in deltoid complex tears

MRI Appearance

  • T1-weighted images:

    • Normal ligament: low signal intensity (dark band) between talus and calcaneus

    • Injuries: poor definition, discontinuity, or intermediate signal suggesting partial tear

    • Surrounded by bright fat in subtalar region for contrast

  • T2-weighted images:

    • Normal: low-to-intermediate signal

    • Tears: focal or diffuse bright hyperintensity indicating fiber disruption or edema

    • Partial tears may appear as thickened, ill-defined ligament with high signal foci

  • STIR:

    • Normal ligament: dark

    • Pathology: bright hyperintense edema, surrounding joint effusion, or hematoma

  • Proton Density Fat-Saturated (PD FS):

    • Normal: compact, dark, continuous band

    • Partial tears: irregular hyperintense streaks within fibers

    • Complete tears: gap filled with high-signal fluid

  • T1 Fat-Sat Post-Contrast:

    • Normal: no significant enhancement

    • Injured ligament: periligamentous enhancement in acute injury due to vascularized granulation tissue

    • Chronic tears: non-enhancing gap with scar tissue around it

CT Appearance

Non-Contrast CT:

  • Ligament itself poorly visualized due to soft-tissue density

  • Indirect findings: bony avulsions, joint malalignment, or adjacent calcifications in chronic cases

Post-Contrast CT (standard):

  • Limited role in direct ligament visualization

  • May show associated synovitis or capsular enhancement in ligamentous injury

MRI images

Medial talocalcaneal ligament axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI images

Medial talocalcaneal ligament coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000