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Wk 4, Case 3 - Review

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These are images of a 32-year-old man

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who sustained an injury while at work.

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Axial images demonstrate complete discontinuity

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of the anterior syndesmotic ligament.

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The anterior tibiofibular ligament is

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detached from its insertion at the fibula.

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The injury is outlined by fluid

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propagating from the syndesmotic space,

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demonstrating the retraction of the fibers

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towards the tibial origin.

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On axial images, we also see the presence of a

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slightly displaced posterior malleolar fracture,

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a volarized fracture, with fluid noted at the

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level of the fracture gap and reactive marrow edema.

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Notice made of integrity of the posterior tibial

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ligament with edema of the syndesmotic membrane,

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but no discontinuity or gapping of the tibiofibular

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space noted on these non-weightbearing MRI studies.

Report

Patient History
32-year-old man complaining of left ankle pain following a work injury

Findings
SKELETAL/BONES:
Nondisplaced oblique fracture of the posterior malleolus of the distal tibia, with a fracture fragment measuring 1.8 x 1.8 x 0.8 centimeters. Fracture extends to involve the posterior tibiotalar articular surface, without cortical step-off. Microtrabecular fracture of the dorsal talar neck.

Focal osteoedema involving the medial distal fibula at the interosseous syndesmotic ligament insertion.
No further micro- or macro-trabecular fracture or reactive pattern of marrow edema/contusion.

ARTICULATIONS:
Tibiotalar joint/talar dome: No osteochondral defect of the talar dome or tibial plafond. Moderate capsulitis with a small effusion.
Ankle mortise/syndesmosis: The ankle mortise is in anatomic alignment. No syndesmosis widening.
Chopart joint: Unremarkable.
Midfoot/hindfoot: No fracture or injury of the anterior calcaneal process. No prominent midfoot or hindfoot arthrosis.

LIGAMENTS:
High ankle: Complete full-thickness tear of the lateral aspect of the anterior tibiofibular ligament. Swollen sprained interosseous syndesmotic ligament, without tearing. Posterior tibiofibular ligament intact. No passive syndesmotic diastasis.
Low ankle: Intact. Mild swelling the anterior talofibular ligament.
Subtalar/Chopart: Intact.

TENDONS:
Intact.

GENERAL:
Sinus tarsi: Unremarkable.

Muscles: No traumatic muscle injury. No volumetric muscle atrophy.
Soft tissue: Swollen sprained inferior extensor retinaculum laterally (stem ligament).
Plantar fascia: Intact.
Neurovascular complex/tarsal tunnel: Unremarkable. No evidence of entrapment neuropathy.
Intra-articular/loose bodies: None.

Impressions
Posterior malleolar fracture (Volkmann’s fracture) with two-part high ankle sprain as follows:
1. Complete full-thickness anterior tibiofibular ligament tear.
2. Swollen sprained interosseous syndesmotic ligament.
3. Intact posterior tibiofibular ligament.
4. No passive syndesmotic diastasis.
5. Low ankle ligaments intact.

Case Discussion

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Todd D. Greenberg, MD

Radiologist

ProScan

Tags

Musculoskeletal (MSK)

MRI

Foot & Ankle

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