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작성자실험맨 조회 2회 작성일 2022-01-13 13:43:36 댓글 0

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[ Anatomy Labrum] #03 Shape, triangular, rounded, crescent-shaped, notched, or cleaved labrum

In regard to shape, the morphology of the normal labrum demonstrates considerable variability on standard MR images.

The cross-sectional shape of the labrum is triangular in most cases (anterior, 64%; posterior, 47%), followed by rounded (anterior, 17%; posterior, 33%).
However, in a minority of cases the normal labral shape can be blunted, cleaved, notched, or even flat.

The anterior and inferior portions of the labrum are smaller than their posterior and superior counterparts, respectively
There is higher variability in the shape of the anterior labrum versus the posterior labrum

The cleaved or notching labrum may be mistaken for a labral tear.
This notched appearance can also result from the close apposition of the middle and inferior glenohumeral ligaments with the anterior labrum.


The labrum may also give a false appearance of notching if one mistakes a closely apposed glenohumeral ligament for part of the labral substance

© 2021 MSK MRI Jee Eun Lee All Rights Reserved.
You may not distribute or commercially exploit the content. Nor may you transmit it or store it on any other website or other forms of the electronic retrieval system.
If you would like to use an image or video for anything other than personal use, please contact me.
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#MSKMRI, #virtualMRI, #radiologist, #Shoulder_MRI, #MSKMRI_Shoulder, #Shoulder_anatomy, #Shoulder_labrum, #glenoidlabrum, #Virtual_MRI, #MRI_illustrator, #glenoid_labrum, #labrum_variant, #SLAPlesion, #shoulderinstability,
sang0114 : 선생님 동영상 보면서 공부하니 정말 좋아요ㅠ 기존동영상 보다끊겼는데 다시 볼수 있는방법은 없겠죠ㅠ

[ Anatomy Labrum] #01 Glenoid labrum shape, flexible labrum, glenohumeral ligament

Let's see how flexible the labrum is.
You might think that the labrum is rigid.
Early authors thought the labrum was uniformly rigid in shape.
The labrum is predominantly composed of moderately dense bundles of fibrous tissue and therefore is quite flexible.

The contour of the anterior inferior labrum can shift from round to triangular when the arm is moved from neutral to abduction-external rotation positioning during an MR arthrogram.
In the ABER position, AIGL pulls the anterior labrum, changing the shape of the flexible labrum to a triangle.

The shape of the labrum dynamically changes from flat in the external rotation of the arm to folded up in internal rotation.

This plasticity is considered the most common reason that the tip of a normal labrum can be rounded in shape.

© 2021 MSK MRI Jee Eun Lee All Rights Reserved.
You may not distribute or commercially exploit the content. Nor may you transmit it or store it on any other website or other forms of the electronic retrieval system.
If you would like to use an image or video for anything other than personal use, please contact me.
(jamaisvu1977@gmail.com)

#MSKMRI, #virtualMRI, #radiologist, #Shoulder_MRI, #MSKMRI_Shoulder, #Shoulder_anatomy, #Shoulder_labrum, #glenoidlabrum, #Virtual_MRI, #MRI_illustrator, #glenoid_labrum, #labrum_variant, #SLAPlesion, #shoulderinstability,
Ezio Auditore : thanks for coming back)))

[Tear_30] Ramp lesion_Summary_meniscocapaular tear, Grief, Thaunat classification

Meniscal ramp lesions can be defined as longitudinal vertical and/or oblique peripheral tears in the posterior horn of medial meniscus, in a mediolateral direction of less than 2.0 cm, that may lead to meniscocapsular or meniscotibial disruption with a concomitant ACL injury.

There are few classifications regarding meniscal ramp lesions.
Thaunat et al. approached a more comprehensive classification system which incorporates tear pattern, direction, tear thickness (partial versus full), and associated meniscocapsular junction, red-red zone, or meniscotibial ligament disruption and instability.

Greif et al. extended Thaunat classification.

Let's summarize the ramp lesion using Grief classification.

Type 1 Ramp lesion is an isolated posterior superior meniscocapsular tear.
Meniscocapsular tears are located peripherally and involve the synovium, leading to posterior meniscocapsular separation from the posterior horn of the medial meniscus.

Ramp lesion type 2 is a peripheral partial thickness tear involving the superior margin of the posterior horn, where the torn fragment contains the intact meniscocapsular attachment to the posterior horn.

Type 3A represents a vertical peripheral tear of the inferior margin of the posterior horn containing the attachment of the meniscotibial ligament.
Though not torn, the meniscotibial ligament is no longer directly connected to the medial meniscus, and thus becomes unstable.

The type 3B is a tear of the meniscotibial ligament itself from its attachment to the posterior horn.
​​This includes rupture in the midsubstance of the ligament or an avulsion of the ligament from the meniscal insertion.

The subtype 4A is a complete longitudinal vertical tear of the red-red zone of the meniscus, with the meniscocapsular and meniscotibial ligaments intact but connected to a portion of the posterior horn junction via a free-floating fragment of the meniscus, thus leading to instability of both structures

The subtype 4B involves a complete tear of the junction itself where the meniscocapsular and meniscotibial fibers attach to the posterior horn.
Edema and irregularity of the meniscocapsular junction of the posterior horn are the most frequent findings.
A fluid signal cleft at the meniscocapsular junction is most specific for making the diagnosis.

In type5 tear pattern, there are two separate tears within the red- red zone of the meniscus. So this is called a double tear.
Type 5 ramp lesions are similar to type 4a.
Similar to the 4A subtype, the meniscocapsular and meniscotibial ligaments are intact.

© 2021 MSK MRI Jee Eun Lee All Rights Reserved.
You may not distribute or commercially exploit the content. Nor may you transmit it or store it on any other website or other forms of the electronic retrieval system.
If you would like to use an image or video for anything other than personal use, please contact me.
(jamaisvu1977@gmail.com)
#MSKMRI, #virtualMRI, #radiologist, #Knee_MRI, #MSKMRI_Knee, #Knee_anatomy, #Knee_meniscus, #meniscus, #Virtual_MRI, #MRI_illustrator, #medialmeniscus, #MM, #meniscustear, #medialmeniscustear, #Ramplesion, #longitudinaltear, #ACLtear,#meniscocapsularseparation
우리는라떼 : 저 이 채널 잘 보고있는 사람인데요 ㅠㅠㅠ 예전 영상도 공개해주시면 안되나요 ㅠㅠㅠㅠㅠ 부탁드려요
MSK MRI Jee Eun Lee : 죄송합니다
우리는라떼 : 혹시 안되는 이유가 따로 있는 건가용 ㅠ

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