Diagnostic Imaging and Management of Acute Shoulder Pain

Initial Diagnostic Imaging

The American College of Radiology recommends beginning with standard shoulder radiographs, including AP views in internal and external rotation plus axillary or scapula-Y view, to rule out fracture or dislocation, and then initiating conservative management with sling immobilization for comfort and early targeted rehabilitation unless imaging reveals surgical pathology 1, 2
Radiographs are the mandatory first step in evaluating acute traumatic shoulder pain with mechanical symptoms like popping and clicking, and should include a minimum 3-view series: anteroposterior views in both internal and external rotation, plus either an axillary or scapula-Y view 1, 2
The axillary or scapula-Y view is critical, as glenohumeral and acromioclavicular dislocations are frequently misclassified on AP views alone 1, 2
Radiography with the patient upright is preferred when possible, as supine positioning can underrepresent shoulder malalignment 3
Radiographs identify fractures, dislocations, and guide whether surgical versus conservative management is appropriate 1, 2

If radiographs are normal or indeterminate but symptoms persist, consider MRI without contrast as the next step, which can identify rotator cuff tears, labral injuries, osseous contusions, and acromioclavicular sprains that explain popping/clicking symptoms 2
In the acute post-traumatic setting, non-contrast MRI is preferred over MR arthrography 2
CT without contrast is reserved for characterizing complex fracture morphology when radiographs show fractures but surgical planning requires more detail 2
Ultrasound has limited utility in acute trauma unless specifically evaluating rotator cuff or biceps tendon pathology, and is operator-dependent 4

Physical therapy should address scapular coordination and rotator cuff function, as scapular dyskinesis commonly contributes to ongoing symptoms 5

Do not skip the axillary or scapula-Y view, as dislocations are often missed on AP-only series 1, 2
Do not assume absence of fracture in elderly patients, even with minimal trauma history, as osteoporotic fractures occur with trivial mechanisms 5
Do not delay imaging if clinical suspicion is high for structural pathology, even if symptoms seem mild 6
Popping and clicking specifically suggest labral pathology, cartilage injury, or instability—if symptoms persist beyond 2-4 weeks of conservative care with normal radiographs, obtain MRI 2, 5

Patients under 35 years: Prioritize evaluation for instability, labral tears, and sports-related injuries as primary causes of mechanical symptoms 4, 5
Patients over 35-40 years: Focus on rotator cuff disease and degenerative changes as predominant pathology, though traumatic tears still require identification 4, 5
Full-thickness rotator cuff tears, particularly if traumatic and massive, should be considered for surgical consultation, as expedited timeline improves functional outcomes 1

The American College of Radiology recommends obtaining standard shoulder radiographs immediately with a minimum three‑view series (anteroposterior internal and external rotation, plus an axillary or scapula‑Y view) to accurately classify AC‑joint separations and detect associated bony injuries. 7
Inclusion of the axillary or scapula‑Y view is essential because AC‑joint dislocations are frequently misclassified when only an anteroposterior view is obtained. 7

In the acute post‑traumatic setting, the American College of Radiology advises using non‑contrast MRI (without arthrography) because post‑traumatic joint effusion provides sufficient visualization of soft‑tissue structures, making it the preferred modality for detecting occult injuries. 8

For patients younger than 35–40 years, AC‑joint injuries usually stem from sports or high‑impact trauma; clinicians should carefully assess for accompanying instability or labral pathology. 7