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Wk 9, Case 3, Foot/Ankle MR - Review

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Here we had a 15 year old female with left ankle pain since volleyball

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injuries. So young patient who has had a sports injury.

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So I just wanted to see if I can see those ligaments. So this is your, uh,

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tio tailor will be the deep deloid. See, this is the,

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this is tibials posterior deep to it. This is your spring,

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and the band that comes from the tibia to the spring is your tibia spring.

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So here, deltoid ligaments abnormal, there is increased signal.

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There is marrow edema at its attachment site,

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but I don't see any discontinuity of the fiber,

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so I'll call this as a deltoid ligaments sprain. Okay,

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other things on this case, uh, echoes tendon.

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There is trace fluid in the retrocalcaneal bursa.

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Little intermediate signal here.

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And that's a gradient sequence. Let's make sure, um,

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yeah, a little bit of tendinosis, but other than that, nothing major. Uh,

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plantar fascia looks okay.

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Now moving on to the ankle ligaments, starting from tibian fibula.

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I'll move on to the axial images. This is my,

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uh, syndesmotic area, so there shouldn't be any widening here.

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Not too much of fluid. Little bit of fluid is fine.

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And I come to the fibia fibular ligaments. Again,

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I can check them on axial images.

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So this is where my interior tip fibs looks intact,

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though there is a lot of edema there. Um, this is posterior tip fib,

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uh, looks okay as I move down further,

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come to the level of the ular fossa.

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This is where I expect the anterior and posterior talo fibrile ligaments to be.

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I do see the posterior tail of fibrile ligament,

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but the anterior talo fibular ligament is missing.

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There's a lot of joint effusion, more localized fluid int laterally.

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So these are all your like, and I don't see the, the, the band at all.

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So this will be a complete acute tear of the anterior talo fibular ligament.

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That's one of the most common, um,

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lateral ankle ligaments to be injured. And all this fluid, uh,

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it's an acute injury. It's bright on T two. It has some brightness on T one.

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So there is a, that's why on the report we called it as a hematoma formation.

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Okay, so, um, complete, um,

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anterior talo fibrillin ligament there with hematoma,

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there's increased signal along paf,

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so some sprain of the posterior talo fibrile ligament.

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And let's look at the calca fibula. So this is where the calca fibula is.

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It's it's bright signal,

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but again, I could trace the fiber. So again, um,

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I would just call it as a sprain of calca fibula. Um,

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so those are the lateral ankle ligaments. We already looked at the deloid,

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which again looked like a sprain, not a tear.

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The spring ligament looks okay. Yeah, this is the,

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the rest of the spring ligament.

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Moving on to the axial images for the plantar components of the

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spring ligament. And this is where they are. So they look okay.

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Then moving on to the tendons, the median re reflector tendons,

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little bit of edema, a bit of fluid,

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but that can be reactive because there's so much going on with the ankle.

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So you can get a little bit of fluid,

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but doesn't look like flore tenovus of any of the tendons.

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The extensive tendons are fine. And now we are seeing a lot of, um, bone, um,

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changes too. There are a lot of areas of bone marrow edema.

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So we need to carefully look at it because we have had a, uh,

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we've already found a complete anterior tibular ligament hair.

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And then this has been marked with a arrow here,

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but you see that fracture line edema on T two and you see the nice fracture

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line, uh, on T one weighted images. So we are here,

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we have a non-displaced lateral ular fracture, and it's, uh, it's the epiphysis,

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but if we don't talk in terms of epiphysis, what we talk of,

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whether it's at the level of syndesmosis above the syndesmosis or below the

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syndesmosis. So ankle injuries. When you have these twisting injuries, we,

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if there's a fracture, uh, we, we try to put it in the Weber classification. Uh,

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and any infrared, uh, uh, syndesmotic fracture is a Weber a injury.

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So this will be a Weber a injury.

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Let's see if we see any other displaced fractures,

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just some signal.

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And then we have, um,

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ly bright signal along the anterior aspect of the distal tibial ular surface.

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Focal hypo intensity looks like an, like a focal impaction injury.

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Then there is lot of, uh, marrow change in the tails,

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which is bright. Um, dark signal on on T one weighted images.

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So this would be a MicroTAC injury in the tails.

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And you have similar signal in the oid.

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So there's another microtrabecular injury in the, in the OID as well.

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Let's see what this is. Some more areas of marrow contusions,

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but the joints otherwise look okay.

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I didn't see any evidence of any cartilage loss anywhere.

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The posterior joint looks okay. The tibio Taylor joint looked okay.

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Interior process of calcaneus in that, that's where we see it.

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The tarsal tunnel was okay, sinus tarsa, you have reactive edema,

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but the ligaments are okay. Yeah. So this would be more of a ankle injury,

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whether we, we have an intra syndesmotic,

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Lateral Mylar fracture. We have, um, uh,

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mar contusions in the anterior tibia tails cuboid. Um,

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and then, um, we have, um,

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complete air of the anterior talo fibular ligament with hematoma formation,

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sprain of the posterior fibular calcan, fibular deltoid.

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Yeah. So those, those will be the main findings of, um, in this case.

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So here, I mean, uh, when you have these, um,

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like extensive areas of marrow edema, we need to make sure, um, look for a,

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if there's a fracture line or not. Fractures change management, uh,

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contusions versus fractures. It's, uh, changes the management.

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So we have to look at that. And, and also for ligaments and sports injury,

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looking at the tibia,

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fibular ligaments is important because any injury to the tibial fibular

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ligaments and then high ankle sprain, uh, which is more clinically significant,

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uh, it has, uh, a longer recovery time and if not treated appropriately,

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can lead to long-term ankle instability.

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And injury to the lateral ankle ligaments is common. Uh,

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we see it on like a lot of ankle R exams is a very common

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finding. And anytime you have lateral sided injury,

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you have to make sure the median sided structures are okay because ankle

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injuries are often twisting injury. They're in a form of an arc.

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So one side is involved,

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you have to make sure there's no injury on the other side.

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So those were the key key findings in this case.

Report

Patient History
15-year-old female with ankle pain after a volleyball injury.

Findings
ARTICULATIONS:

Bones: Incomplete infrasyndesmotic fracture coursing through the anterior aspect of the fibular epiphysis reaching the physis without displacement and surrounded by diffuse osteoedema.

Contusional microtrabecular fractures of the medial malleolus posterior colliculus.

Nondisplaced microtrabecular fractures coursing through the medial aspect of the talar neck.

Contusion microtrabecular osteochondral fractures involving the midline anterior aspect of the tibial plafond.

Nondisplaced microtrabecular fractures or stress injury surrounded by moderate osteoedema at the anterolateral aspect of the cuboid involving the 4th and 5th tarsometatarsal joints.

Tibiotalar Joint: No osteochondral defects.

Hindfoot: No arthropathy.

Midfoot: No arthropathy.

LIGAMENTS:

Full-thickness tear of the anterior talofibular and calcaneofibular ligaments. High-grade sprain of the posterior talofibular ligament. Ill-defined hematoma formation at the anterolateral gutter.

The anterior and posterior tibiofibular and syndesmosis are intact.

Low-grade sprain of the superficial (tibiocalcaneal, tibiospring and tibionavicular ligaments) and the deep components (posterior and anterior tibiotalar ligaments) of the deltoid ligament complex.

High-grade sprain of the interosseous talocalcaneal ligament, cervical ligament, medial, intermediate and lateral root of the inferior extensor retinaculum at the level of the sinus tarsi.

TENDONS:

Peroneus Longus/Brevis: Intact.

Posterior Tibialis: Intact.

Flexor Compartment: Intact.

Extensor Compartment: Intact.

GENERAL:

Muscles: No traumatic muscle injury. No volumetric muscle atrophy.

Soft Tissues: Ill-defined hematoma formation at the anterolateral gutter. Reactive synovitis within the sinus tarsi. Diffuse periarticular soft tissue swelling.

Plantar Fascia: No thickening, inflammation, enthesophyte formation, calcaneal osteitis or heel fat pad edema.

Joint Effusion: Tibiotalar and posterior subtalar effusions/hematoma.

Intraarticular/Loose Bodies: None.

Impressions
1. Incomplete spiral infrasyndesmotic fracture involving the anterior aspect of the fibular epiphysis reaching the physis without displacement (Salter-Harris type 3) with microtrabecular fractures of the medial malleolus posterior colliculus in keeping with a Weber A stage 2 injury.

2. Full-thickness tears of the anterior talofibular and calcaneofibular ligaments with anterolateral gutter hematoma formation.

3. Low-grade sprain of the superficial and deep components of the deltoid ligament complex.

4. High-grade sprain of the sinus tarsi ligaments (talocalcaneal, cervical, medial intermediate and lateral roots of the inferior extensor retinaculum) with reactive synovitis.

5. Nondisplaced microtrabecular fractures coursing through the medial aspect of the talar neck.

6. Contusional osteochondral fractures involving the midline anterior tibial plafond.

7. Nondisplaced microtrabecular fractures or stress injury at the anterolateral aspect of the cuboid involving the 4th and 5th tarsometatarsal joints.

8. Tibiotalar and posterior subtalar effusions/hematoma formation.

Case Discussion

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Gitanjali Bajaj, MD

Assistant Professor

University of Arkansas for Medical Sciences

Edward Smitaman, MD

Clinical Associate Professor

University of California San Diego

Brian Y. Chan, MD

Assistant Professor of Musculoskeletal Radiology

University of Utah

Tags

Musculoskeletal (MSK)

MRI

Foot & Ankle