Best Radiographic View for Shoulder Dislocation
For confirming shoulder dislocation, obtain a minimum 3-view series including AP views in internal and external rotation PLUS either an axillary or scapular Y-view—the orthogonal view (axillary or scapular Y) is absolutely essential because dislocations can be completely missed on AP views alone 1.
Why the Orthogonal View is Critical
The AP view alone is insufficient and dangerous. Glenohumeral joint dislocations are frequently misclassified when only AP projections are obtained 1. You must have an orthogonal view to confirm the relationship between the humeral head and glenoid fossa.
Choosing Between Axillary vs Scapular Y-View
The scapular Y-view is generally preferred over the axillary view for the following reasons:
- Patient comfort: 81% of patients prefer the scapular Y-view due to significantly less pain during positioning 2
- Technical ease: Once the technician is experienced, the scapular Y-view is easier to obtain than the axillary view, especially in acute trauma 2
- Diagnostic accuracy: In head-to-head comparison, the axillary view failed to give the correct diagnosis in 8% of cases when compared to the scapular Y-view 2
- Positioning challenges: The axillary view requires arm abduction which may be impossible in an acutely dislocated, painful shoulder 3
Important Caveats
- Hill-Sachs lesions: The axillary view is superior for detecting Hill-Sachs lesions 2. If you need to evaluate for this associated injury, add a Stryker notch view (which identifies Hill-Sachs defects in 93% of cases) 1, 4
- Alternative when scapular Y fails: If the scapular Y-view cannot be obtained, the 60-degree anterior oblique view is equally effective for detecting dislocations and is easier than the axillary view in acute trauma 3
Post-Reduction Imaging
After reduction, repeat imaging is mandatory to confirm successful reduction and rule out complications 5. Use the same 3-view series.
Algorithmic Approach
- Initial presentation: Order AP (internal + external rotation) + scapular Y-view
- If scapular Y technically difficult: Substitute with 60-degree anterior oblique
- If concerned about Hill-Sachs: Add Stryker notch view
- Post-reduction: Repeat the same 3-view series to confirm reduction