Shoulder MRI Guidelines

Introduction to Shoulder MRI

The American College of Radiology recommends MRI without IV contrast as the appropriate imaging study for evaluating rotator cuff tears, instability, labral tears, and other soft tissue pathology in both acute and most chronic settings 1, 2

For suspected rotator cuff tears, MRI shoulder without IV contrast is the optimal imaging modality, especially when physical examination suggests rotator cuff pathology with negative or indeterminate radiographs 1, 2, 3
For acute dislocation or instability, MRI without IV contrast is preferred over MR arthrography because a posttraumatic joint effusion or hemarthrosis is typically present and provides sufficient visualization of soft tissue structures without needing injected contrast 1, 2, 4
For suspected occult fractures, MRI without IV contrast can demonstrate bone marrow edema from trauma and identify associated soft tissue injuries like rotator cuff or labral tears 1, 2

For subacute or chronic labral tears, MR arthrography is considered the reference standard with 86-100% sensitivity for labral injury detection, especially when the glenohumeral joint effusion is too small to provide adequate joint distention 4, 5
For chronic instability without acute effusion, MR arthrography is preferred over noncontrast MRI for diagnosing labroligamentous and rotator cuff injuries 4, 7
For equivocal partial-thickness rotator cuff tears, MR arthrography can help distinguish between full and partial thickness tears 3, 6

The American College of Radiology suggests that the timing of injury determines whether MR arthrography is needed, with acute trauma (with joint effusion present) preferring MRI without IV contrast, and chronic symptoms (minimal joint fluid) potentially requiring MR arthrography 1, 4, 5
There is no relevant literature supporting the use of MRI shoulder with IV contrast (non-arthrographic gadolinium) for shoulder pain evaluation, and standard IV contrast does not provide the joint distention needed for optimal soft tissue visualization 8, 4, 7

The American College of Radiology recommends starting with plain radiographs (AP views in internal/external rotation plus axillary or scapula-Y view) before advancing to MRI 1, 9
If radiographs are negative or indeterminate, acute trauma/pain should be evaluated with MRI shoulder without IV contrast, while chronic labral symptoms (>6-8 weeks) may require MR arthrography 1, 2, 4, 5