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Wk 8, Case 4, Foot/Ankle MR - Review

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The history on this one was a 47 year old complaining of lateral ankle

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pain radiating up to the lower leg. So in this case,

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uh, we have a, a,

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a nice case of an osteochondral injury, or,

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or OCD or OCL, uh, osteo, chondra,

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desican, dessicans, whatever you and your, um, uh,

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clinicians and at your institution use. Um,

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but we see here that, uh, there is,

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okay, this, uh, um,

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osteochondral injury at the medial Taylor Dome,

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probably more centrally or midline. Okay? Uh, and,

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uh, what I wanna point out with this, uh, OCD or OCL, okay,

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that there is fluid undercutting about this, uh,

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two centimeter lesion within the, uh, lesion, uh, bed.

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So when, if you read the literature, uh, there are various terms, okay?

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I've heard of, um, you know, uh, bone fragments, uh,

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you know, progeny, uh, lesion bed, things like that. Um,

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but again, I would highly recommend just talking and communicating, have a,

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uh, open dialogue with your referring clinicians just so that we, uh,

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that you're describing accurately for, uh, for them if, uh,

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particularly if surgery is being planned. The important thing with these OCDs,

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okay, or osteo OCLs, okay, is the, the,

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not only the size, but characteristics of instability, okay?

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And the signs that I, uh, that have been written in the literature,

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particularly by, uh, the Dr. Deme out of, uh, Wisconsin and others,

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okay? Some things to look for besides obviously, um,

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the fragment being displaced out, uh,

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of the bone lesion or lesion bed. Okay? Um,

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that's obviously gonna be unstable.

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Other things you wanna look for are fluid bright, okay? Fluid bright,

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uh, okay. But if it's not fluid bright, uh,

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it can be, uh, depending on who you read, it's been described as, uh,

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healing or fiber. Gran, uh, fiber, uh, uh, fibrous the sort of,

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uh, granulation tissue, okay? If you're not sure, and you're just, uh,

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making the call, uh, of possible instability off of, uh,

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a non-contrast, Mr. Let's say,

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you can always recommend that the patient gets an, uh, uh,

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an arthrogram CT or, or, or a MR and prove that,

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uh, you know, there is contrast, bright fluid undercutting that, uh,

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the progeny and, and into that lesion bed there, okay?

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Other tips that, uh, or other, other signs that

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You may be dealing with an unstable lesion, okay? Is, uh, sclerosis,

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uh, disruption, uh, or,

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and defects within the overlying articular cartilage, right?

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Sclerosis, uh, multiple cysts or, uh,

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or cyst larger than five millimeters. So,

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so those are some of the things that,

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that have been described in the literature for these, uh, um, OCDs.

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Another thing that, uh, for those that, uh, uh,

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want to read and study more and can be confusing, um, that you may encounter,

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uh, in the literature, okay, is, uh,

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discussion about contained or uncontained lesions,

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or that is, um, uh,

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shouldered or un shouldered lesions. Okay? So it, it can be confusion,

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uh, but basically a sh uh, a shouldered lesion, okay?

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Or that is an, uh, an uncon a shoulder, as I understand,

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is also known as an uncontained lesion, okay?

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A non shoulder lesion is, is also known as a contained lesion,

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okay? But the whole point of that is if,

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if the OCD lesion involves the rounded

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aspect, okay, of the tailored dome or tailored body,

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and particularly cuts down in onto the vertical side of the tailored body,

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those, those, um,

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uncontained or shoulder lesions are more difficult to treat, um,

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by our podiatrist and orthopedic foot surgeons. Okay?

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It's already a tight spaced, uh, as I, as I am told, um,

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and taught, uh, that it's already difficult to get in there.

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So you can imagine if it's involving that, uh,

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rounded aspect or that vertical aspect of the tailored body, it's,

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it's even harder as, as I understand it, okay? So not, so that's another,

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uh, important thing to mention, uh, in your, uh, in the report besides,

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uh, mentioning that it could be a, a unstable or, or a stable lesion.

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So in this case, um,

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this arguably is probably maybe cutting down or involving that rounded

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aspect or that shouldering and cutting down to the vertical aspect of that Alis,

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which, which, uh, articulates with the medial mallis, obviously. So this may be,

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uh, a more difficult, uh, lesion for our, for our surgeons to deal with,

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um, in this unstable and, uh,

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uncontained shoulder lesion. And for those that are interested,

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I believe, uh, if you look up Dr. Choi et al,

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and I believe the articles from a, uh,

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American Journal of Sports Medicine back in,

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I wanna say 2013 or 2012,

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and I can try to dig up the article and send it to y'all as well. Um, but that,

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that's a nice discussion. And if you just

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Look at the, uh, the few figures provided in that article,

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uh, it ni it high, it,

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it displays nicely what they're talking about by an uncontained and contained or

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shouldered and un shouldered lesions. 'cause that can be confusing at times,

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at least for me.

Report

Patient History

47M pt c/o pain in lateral ankle radiating up lateral lower leg

Findings

ARTICULATIONS:

Bone: Unstable mildly displaced nonshouldered osteochondral defect surrounded by osteoedema located at the medial weight-bearing surface of the talar dome and measures 6mm in depth, 8mm in width and 11mm in anteroposterior dimensions.

Tibiotalar joint: No arthrosis.

Hindfoot: No arthrosis.

Midfoot: Focal penetrating chondromalacia with tiny subchondral arthropathic cysts at the talonavicular joint.

LIGAMENTS:

The anterior talofibular, calcaneofibular, posterior talofibular, lateral high ankle ligaments, syndesmosis and deltoid ligament complex are intact.

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 Tissue: Unremarkable.

Plantar Fascia: Intact.

Joint Effusion: 1-2+.

Intra-Articular/Loose Bodies: None.

Impressions

1. A 6mm x 8mm x 11mm, unstable, mildly displaced, nonshouldered osteochondral defect at the medial weight-bearing surface of the talar dome.

2. Tiny focal penetrating chondromalacia at the talonavicular joint.

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

Todd D. Greenberg, MD

Radiologist

ProScan

Tags

Musculoskeletal (MSK)

MRI

Foot & Ankle