mri of shoulder injury
TRANSCRIPT
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MRI OF SHOULDER JOINT
Dr Krishna Kiran MD.DNB.FRCR RadiologistCalicut
This presentation is intended for medical and
allied professionals.
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What is T1,T2.. And many other fancy names used in MRI..??
T2 T1 FAT
SUPPRESSED
STIR/PDFS
Common sequences in MRI shoulder
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How do you do shoulder MRI..
Shoulder MRI is done in a plane parallel to supraspinatus.
Generally sequences obtained are
Coronal plane T1, T2, Fatsuppressed (STIR or PDFS)
Axial - T1, fatsuppressed
Sagittal - T2 and fat suppressed.
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Key section in shoulder coronal image in the middle third
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Anterior coronal section
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Posterior coronal section shoulder
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Sagittal section
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Axial anatomy
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After review of anatomy , Let us proceed to our case.
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CASE 1?ROTATOR CUFF TEAR
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Full thickness tear supraspinatus tendon except fibers in anterior third
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Complete tears of supraspinatus tendon are accompanied by muscle atrophy and fatty infiltration.
These are important negative prognostic factors for tendon repair and shoulder arthroplasty.
Muscle thickness using Fat occupancy ratioand fatty infiltration of muscle can be assessed on MRI.
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Fat occupancy ratio
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Reduced fat occupancy Normal fat occupancy
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Fatty infiltration
supraspinatus
Normal supraspinatus
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Case 2
? Rotator cuff tear
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Avulsion Fracture greater tuberosity of humerus
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Case 3
?RCT
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Rimrent or PASTA tear
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Rimrent or PASTA tear
A partial tear that extends to articular surface does not extent to bursal surface.
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Case 4
Recurrent Dislocation shoulder
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Anterior middle posterior
Coronal sections
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Posterior sections of shoulder
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Hill Sach Lesion
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Anterior labral tear
Normal anterior labrum for comparison
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Labral clockClockwise approach to
labrum is the easiest way
to diagnose labral tears
and differentiate them
from normal variants.
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ABER view
Abduction external rotation view of shoulder is utilized to detect
subtle soft tissue pathology of anteroinferior labrum and rotator
cuff.
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Types of anteroinferior labraltears.
Bankart
lesion
Perthe
lesion
ALPSA
lesion
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Case 5
Shoulder pain and limitation of movement.
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Anterior middle
posterior
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Anterior capsule thickening indicative of adhesive capsulitis.
Normal for comparison
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Case 6
Shoulder pain on overhead hand
movement
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Anterior middle
posterior
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Anterior middle
posterior
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Supraspinatus tendonitis / tendinopathy
MRI shows tendon enlargement and mild intratendinous
hyperintense signal.
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Case 7
Suspected scapula fracture
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3D CT is done to assess
scapula and adjacent
injuries.
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Case 8
An athlete complains of pain on throwing and overhead movement of arm.
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MR Arthrogram
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Hyperintense signal within labrum extending
posteriorly. Indicative of SLAP lesion. (Superior Labral
anteroposterior tear)
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Labrum shows several anatomical variations. Conventional MRI is not
accurate in diagnosing labral tears (40-70% sensitivity and specificity) MR
Arthrography is more accurate (90-95% sensitivity and specificity)
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CASE 1O
History of Trauma
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AP shoulder
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Y view or scapula lateral
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Posterior dislocation
Internally rotated humerus giving light bulb appearance. Y view showing
posterior dislocation.
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Other views of shoulder
Outlet or Neer`s view
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Other views
Axillary view
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What about ultrasound..?
Useful tool in
•Rotator cuff tendinopathy or tear.
•Calcific tendonitis.
•Subacromial bursal effusion.
Limitations
•Many parts of joint can not be
assessed.
•Operator dependent
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Coronal STIR Coronal T2
Some sequences reveal mild bright signal / hyperintensity within
substance of supraspinatus. If seen without tendon enlargement is
indicative of artifact called magic angle phenomenon. Is said to be due
to orientation of collagen fibers.
What is magic angle phenomenon..?
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What is difference between low strength and 1.5T magnet..?
0.2T
1.5 T
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How accurate are shoulder MRI reports..? 15-20% of asymptomatic adults on shoulder MRI
revealed rotator cuff tears.
A shoulder surgeon with correlation between arthroscopy and MRI may be able to correlate image findings better.
In doubtful cases it is better to mutually discuss and proceed.
Sher et al JBJS 1995
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What are types of acromion..?
Type 2 and 3 are
associated with
shoulder impingement
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QUIZ
Shoulder , arm pain after suddenly lifting heavy weight
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SLAP tear
extending to
biceps anchor
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Take home points..
Shoulder is a complex joint , imaging also tends to be complex and prone for errors.
When in doubt discuss and proceed.
Signal within tendon may not be significant , remember magic angle ..!!