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Wk 7, Case 5, Hip MR - Review

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This, I thought was a very interesting case.

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This is hip pain for one day after being tackled in a football game.

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And, uh, going right to the saline findings, we see that, uh, this, uh,

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posterior ace tablum is, uh, basically, uh, fractured along with, uh,

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the, uh, posterior, uh, uh,

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acetabular labum as well as the, uh,

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capsule ligament and structures here posterior. We also see some, uh,

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mild to moderate amount of, uh, surrounding soft tissue and muscle edema.

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Okay. Uh, centered in the region of the obterator internist, uh,

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muscle and tendon right here,

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as we can see right there as it goes to attach upon the medial aspect of the,

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uh, uh, greater tro cantor. Okay.

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And here to, okay. Uh,

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we can see another, uh, we have another shot in the coronal view,

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uh, of this, uh, non-displaced, minimally displaced, uh,

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posterior, uh, acetabular wall fracture, presumably related to a transient,

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uh, a hip subluxation or dislocation event. And, and interestingly,

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this, uh, for those that are interested,

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I think this was originally or one of the seminal papers,

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papers was written by, um, Dr. Hollis Potter in, in, uh,

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JBJS, uh, a few years back. And if you, uh,

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watch, uh, replays of, uh, especially American football games, uh,

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some of these athletes, uh, I, I believe, uh, for instance,

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if, uh, for those that follow American football, um, uh, Bo Jackson,

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a very famous football, uh, NFL football player, uh, uh,

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football who, who, who used to play for the, uh,

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Oakland or the Los Angeles Raiders, uh,

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some believe had this injury where they, he, uh,

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during a tackle during the game, he, he, um,

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hyper extended his, his, um,

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his hip and his leg was still able to run with the

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tackler hanging onto his leg. And, uh,

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some believed that he dislocated or translate subluxated and had this

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sort of injury and later went on to, uh, osteonecrosis of the femoral head.

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Um, so this is, uh, uh, before, uh, Dr.

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Potter's article in, in JBJS, I believe it was. Um,

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and we can, uh, try to look for that article and forward that to y'all, um, uh,

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for you guys to glance at, at your leisure. But, uh, an an often unrecognized,

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uh, but serious injury as you can imagine, that can lead to, uh, not,

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obviously not only instability of the hip, but gradual or,

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or premature secondary osteoporosis.

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So something to certainly think about. Um, and, uh, you

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May not, uh, see it,

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or it may not be obvious because the hip often relocates at the time of

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injury. So you wanna be,

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be mindful and pay attention to these secondary signs. A colleague of mine, uh,

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uh, I believe Dr. Hames in s Skull Radiology, along with, uh,

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some of his trainees, uh,

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put out an article of some of these secondary findings of, uh, of,

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uh, uh, hip di hip dislocation.

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So I also highly recommend that article. Um, I forget the first author.

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I apologized, but that was certainly in, uh, definitely in, uh,

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skeletal radiology, some of those findings there.

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So really a nice case of, uh, uh, transient, uh,

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assuming transient, uh, hip, uh,

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posteriorly directed hip subluxation or dislocation with resultant, uh, uh,

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uh, fracture and, uh, uh, labral pathology. Uh,

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best obviously seen on this, uh, axial o bleak sequence.

Report

Patient History

Patient states pain in posterior hip joint for 1 day. Patient's pain started after being tackled last night in a football game.

Findings

SKELETAL: Mildly displaced osseous fragment measuring 1.1cm x 1.2cm x 3cm (AP, transverse and CC dimensions) involving the entire posterior acetabular column.

PELVIS: Visualized right sacroiliac joint, right iliac blade, iliopectineal and ilioischial lines are intact.

JOINTS: No hip osteoarthrosis or chondromalacia.

Small effusion or hemarthrosis. No internal debris or free bodies.

Supra-acetabular fossa as anatomic variant and incidental finding.

Ligamentum teres is mildly sprained. The iliofemoral and ischiofemoral ligaments are intact.

Normal femoral head sphericity. No acetabular under or over coverage. Normal tapering at the femoral head-neck junction.

ACETABULUM/LABRUM: Nondisplaced posterosuperior to posteroinferior labral tear. No paralabral cyst.

MUSCLES/TENDONS/LIGAMENTS: Moderate-grade strain of the piriformis, gemelli, obturators internus muscle and tendons.

The rest of the adductor and abductor muscles are intact.

OTHER/SOFT TISSUE: Mild diffuse periarticular soft tissue swelling.

Unremarkable pelvic basin contents. Normal neurovascular bundle.

Impressions

1. Sequela of recent right hip dislocation/relocation suggested by the presence of a mildly displaced 3cm osseous fragment of the posterior acetabular column.

2. Nondisplaced posterosuperior to posteroinferior labral tear. No paralabral cysts.

3. Moderate grade strain of the piriformis, gemelli, obturators internus muscle and tendons.

4. Small effusion or hemarthrosis.

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

Hip & Thigh