MRI of Shoulder Flashcards
rotator cuff is composed of the tendons of four muscles that converge on the greater and lesser tuberosities of the humerus, namely:
supraspinatus, infraspinatus, subscapularis, teres minor
of the rotator cuff muscles, this most commonly causes clinically significant problems and is the one that is most commonly surgically treated
supraspinatus
lies just superior to the scapula and inferior to the AC joint and acromion. it inserts into the greater tuberosity of the humerus
supraspinatus
2 to 3 centimeters proximal to the insertion of supraspinatus is a section of the tendon called the
“critical zone”
critical zone is reported to have ____ and is therfore less likely to heal following trauma
decreased vascularity
critical zone of the supraspinatus tendon is a common location for
rotator cuff tears
a fibricartilaginous ring that surounds the periphery of the bony glenoid of the scapula
glenoid labrum
serves as an attachment site for the capsule and broadens the base of the glenohumeral joint to allow increased stability
glenoid labrum
tears and detachment of the glenoid labrum most commonly occur from and result in
dislocations or instability of the humerus
one of the most common procedurs for shoulder pain whereby the coracoacromial ligament was cut, the anterolateral portion of the acromion was removed, and AC joint osteophytes were resected
Coracoacromial arch decompression
most likely source of most rotator cuff problems
intrinsic degeneration
treating intrinsic degeneration requires
debriding the abnormal tissue and repairing the cuff
rotator cuff is best seen on what view
oblique coronal images that are aligned parallel to the supraspinatus muscle and on oblique sagittal images
primary sequence for imaging the rotator cuff
FSE T2W oblique coronal sequence with slice thickness no greater than 5mm and 3 mm
MR arthrogram is typically performed by injecting how many cc of saline or gadolinium
10 to 15 cc
useful landmark for noting the anterior portion of supraspinatus tendon is the ____, with the anterior most fibers of the supraspinatus found immediately posterolateral to the groove
biccipital groove
normal supraspinatus tendon is said to be of what signal
uniformly low in signal on all pulse sequences
if the signal in the tendon gets brighter on the T2W, it is abnormal and represents
tendinosis or tendinopathy or a partial thickness tear