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37 Cards in this Set
- Front
- Back
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which structure is anterior, acromion or coracoid
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coracoid
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where does the long head of biceps insert
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superior labrum
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magic angle phenomenon in shoulder
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collagen fibers are oriented 55 degrees to the magnetic induction field
occurs 1cm prox to insertion of supraspinatus |
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which muscle of rotator cuff is most anterior
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subscapularis (think of the sag-oblique images, coracoid is most anterior (to right of the screen)
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sublabral foramen
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detached ant/sup portion of labrum
separated from osseous glenoid superiorly, but is attached in mid/inferior portion |
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how does appearance of sublabral foramen differ from a labral tear
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the fluid does not extend medially across entire labral attachment
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buford complex
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absent anterior/sup labrum assoc with markedly thickened middle glenohumeral ligament
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how to find the superior glenohumeral ligament
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find the superior most images of the supraspinatus on axial imaging and look anteriorly for a low signal structure oriented perpendicular to the supraspinatus tendon
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how to find the inferior glenohumeral ligament
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go to the inferior-most portion of the joint capsule on coronal images and it serves as the boundary
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two locations to describe location of a tendon tear
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bursal or articular surface
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which is more common location for supraspinatus tear : articular or bursal surface
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articular
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how to differentiate between degenerative signal within a tendon and a tear
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if the increased signal within the tendon equals that of fluid, then it's a tear, otherwise, is degenerative
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most common type of partial supraspinatus tear
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rim rent tear (insertional fibers of rotator cuff on greater tuberosity are disrupted from bone)
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#1 location for suprapinatus tendon tear
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at insertion of fibers onto the greater tuberosity (aka critical zone)
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where is the critical zone
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1-1.5cm proximal to the tendon insertion
(happens to be at same location of magic angle on axial images) |
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full thickness tear
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extends from superior to inferior surface
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complete full thickness tear
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full thickness tear that extends completely in the AP dimension.
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what holds the biceps tendon in place
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transverse humeral ligament
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what is the rotator cuff interval
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triangular space between supraspinatus and subscapularis tendons
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what constitutes a massive rotator cuff tear
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at least 2 of the 4 cuff tendons (usually supra and infraspinatus)
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course of superior glenohum ligament
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originates from superior glenoid tubecle anterior to long head of bices. inserts on lesser tuberosity
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how often can the middle GH lig be absent
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up to 30% of time
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which GH lig is main shoulder stabilizer
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inferior glenohumeral ligament
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where does IGHL insert
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anterior and posterior labrum (has 2 bands)
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HAGL lesion
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avulsion of inferior GH ligament from humerus
"Humeral Avulsion of GH ligament" |
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mechanism of HAGL lesion
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dislocation
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what is HAGL often assoc with
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subscap tendon tear
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appearance of HAGL lesion on MR
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increased signal of IGHL +/- disruption at its insertion on anatomic neck
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reverse bankhart lesion
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fx of posterior glenoid 2/2 stress with arm in internal rotation and abducation
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trough lesion
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impaction fx of ant/medial humeral head 2/2 posterior disloc
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bankhart lesion
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anterior-inf labral detachment +/- labral tear
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hill sachs deformity
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post-lateral humeral head fx 2/2 anterior dislocation
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ALPSA
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anterior labroligamentous periosteal sleeve avulsion
= avlsion of anterior labrum + intact periosteum |
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how does ALPSA differ from bankhart lesion
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if periosteum is not stripped, then is bankhart
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what anatomically is usually involved in adhesive capsulitis
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rotator cuff interval
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what is adhesive capsulitis
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scar tissue froms around superior GH ligmaent and coracohumearl ligament
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SLAP lesion
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tear involving the superior labrum orientedin AP direction
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