En ortopedia, la lesión de Bankart es una rotura de la parte anteroinferior del reborde glenoideo o labrum glenoideo de la escápula, a consecuencia de una luxación anterior de hombro. Perthes lesion is variant of Bankart lesion, presenting as an anterior glenohumeral injury that occurs when the scapular periosteum remains intact but is stripped. Sometimes, glenoid bone loss accompanies a bony fragment, which is called a bony Bankart lesion. This is observed in.
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Glenoid bony defect What is wrong with a glenoid bony defect?
This was because in this position, the repaired anteroinferior capsule became tight and prevented the anterior translation of the humeral head, even with a large glenoid defect Fig. The image on the left shows an absent anterosuperior labrum, which is called a Buford complex.
Check for errors and try again. Bankart lesions are labral tears without an osseus fragment. There is discontinuity of the IGHL attachment on the humerus with leakage of contrast. The dislocation of the humeral head to antero-inferior causes damage to the antero-inferior rim of the glenoid in the 3 – 6 o’clock position marked in red.
Parke et al 35 evaluated engagement before and after the Bankart repair. Notice the abnormal contour of the anterior glenoid and the avulsed anterior rim arrow.
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For example, the anteroinferior capsule including the inferior glenohumeral ligament IGHL becomes tight when the arm is in abduction, external rotation and horizontal extension. The magnitude and direction of the resultant force by the shoulder muscles depend on the activity and position of the arm. Mid-range stability is provided by the negative intra-articular pressure 34 baankart the concavity-compression effect. MR imaging and MR arthrographic findings with surgical correlation.
It is a very fundamental question. Abstract Shoulder stability depends on the position of the arm as well as activities of the muscles around the shoulder. Although scarring may develop making detection both on imaging and arthroscopy difficult to interpret, the shoulder remains unstable, bankwrt re-attachment of the labrum is performed.
One method is dynamic examination. Please help to improve this article by introducing more precise citations.
Now you know that you have to look for a Bankart or variant. As long as we use the subjective assessment, such as one-third or one-quarter, we will never be able to determine the critical size of a defect which needs to be treated. The arrow points to the intact periosteum.
In French [ PubMed ]. Figure 1 Figure 1. Log in Sign up. J Shoulder Elbow Surg ; 2: SLAP tears start at the 12 o’clock position where the biceps anchor is located, which tears the labrum off the glenoid.
Quantifying glenoid bone loss arthroscopically in shoulder instability. However, as described above, these terms are almost always misused and cause a lot of confusion.
The Radiology Assistant : Shoulder MR – Instability
The tight capsulo-ligamentous structure functions as a stabiliser of the humeral head in the direction of the tight capsule. Hill-Sachs lesion HSL and the glenoid: However, if it goes out of the glenoid track, the anterior rim of the glenoid may fall into the HSL, causing a new dislocation.
As soon as the muscle contraction occurs with the arm elevated, the contraction force by the shoulder muscles pulls the humeral head against the glenoid socket, which in turn creates a resistance force against translation of the humeral head. A best-fit circle is applied, which fits perfectly to the posterior and to the inferior part of the glenoid. Bankart lesions are typically located in the o’clock position because that’s where the humeral head dislocates.
These injuries are always located in the o’clock position because they are llesion by an anterior-inferior dislocation.
Perthes lesion – Wikipedia
Bony defects created anteroinferiorly. This translation of the humeral head is called laxity. Skeletal Radiol ; Recurrent anterior shoulder instability: The capsulo-ligamentous structures are the main stabilisers with the arm at the end-range of movement, whereas negative intra-articular pressure and concavity-compression effect are the main stabilisers with the arm in the mid-range of movement.
Due to these recurrent dislocations significant bone loss and erosion of the anterior glenoid rim may occur, which maintains the unstable situation. On the coronal-oblique and sagittal reconstruction the displaced fragment of the glenoid rim is seen in the o’clock position.
A Clockwise approach to the labrum is the easiest way to diagnose labral tears and to differentiate them from normal labral variants.
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Bankart lesions occur as a direct result of gombro dislocation of the humeral head, whereby the humerus is compressed against the labrum. You can also scroll through stacks with your mouse wheel or the keyboard arrow keys.
In chronic cases there may be fibrosis and resynovialization of the labrum and periosteum. Case 2 Case 2. At the end-range of movement, a part of the shoulder capsule is tight, which prevents a translation of the humeral head on the glenoid socket. Most lesiln prefer to use the linear measurement Fig.