Shoulder X-ray is the Preferred Initial Imaging for Proximal Humerus Fracture
Yes, shoulder X-ray is definitively the best initial imaging study for proximal humerus fracture—it should include at minimum three views: anteroposterior (AP) in internal and external rotation plus an axillary or scapula-Y view. 1
Initial Imaging Algorithm
The 2025 ACR Appropriateness Criteria establishes radiography as the gold standard first-line imaging because it:
- Delineates most shoulder fractures and malalignment 1
- Aids in fracture classification to determine surgical versus nonsurgical management 1
- Confirms appropriate shoulder alignment, which is a primary concern in acute trauma 1
Critical Technical Requirements
The axillary or scapula-Y view is vital—not optional—because AP views alone can misclassify acromioclavicular and glenohumeral joint dislocations 1. This is a common pitfall that leads to missed diagnoses.
When to Proceed to CT
CT without IV contrast should be obtained after initial radiographs when:
- Radiographs show a proximal humerus fracture and you need to characterize the fracture pattern for surgical planning 1
- CT changes clinical management in up to 41% of proximal humeral fractures by revealing the true extent of comminution and displacement 1
- CT is the best examination for delineating fracture patterns and has been shown equivalent to MRI for identifying nondisplaced fractures 2
Why CT Matters for Proximal Humerus Fractures
Poor interobserver agreement exists when grading humeral head fractures on radiographs alone 2. Nondisplaced fracture planes and complex bony anatomy result in underappreciation of fracture extent on plain films 2. Three-dimensional volume-rendered CT images better characterize fracture patterns and humeral neck angulation, which directly affects functional outcomes 2.
Role of MRI (Limited in Acute Setting)
MRI without contrast is inferior to CT for evaluating fracture planes in complex humerus fracture patterns 2. However, MRI may be appropriate when:
- The patient will not undergo surgical fixation and you need to assess rotator cuff integrity 1, 2
- Up to 40% of humeral head fractures have associated rotator cuff tears 2, but these are typically addressed during surgical fixation if surgery is planned
Key Caveat
Immediate diagnosis of soft-tissue injury may not be required since delayed rotator cuff repair (up to 4 months) has not shown adverse outcomes 2.
What NOT to Order Initially
- Ultrasound: Limited by acoustic shadowing for bone evaluation and significantly restricted by decreased patient mobility and swelling in acute fractures 1, 2
- MR arthrography: Not indicated acutely—hemarthrosis provides natural joint distention for soft tissue visualization on standard MRI if needed 2
- CT with contrast: No relevant literature supports its use 1
Bottom Line Algorithm
- Start with 3-view shoulder X-ray (AP internal/external rotation + axillary or scapula-Y)
- If fracture confirmed and surgical planning needed → CT without contrast
- If nonsurgical management planned and rotator cuff assessment needed → consider MRI without contrast
The evidence strongly supports this stepwise approach, with radiography providing the essential initial diagnostic information while CT adds critical detail for surgical decision-making when indicated 1.