How should a 50-year-old man with left shoulder pain be evaluated and managed?

Evaluation and Management of Left Shoulder Pain in a 50-Year-Old Male

Begin with plain radiographs of the shoulder as the mandatory first imaging study, regardless of suspected diagnosis, then proceed to MRI without IV contrast if radiographs are normal or nondiagnostic and soft tissue pathology (rotator cuff tear, labral injury) is suspected. 1, 2

Initial Clinical Evaluation

Obtain a focused history and physical examination targeting:

• Mechanism of injury: Acute trauma, overhead activity, or insidious onset 3
• Pain characteristics: Location (anterior, superior, lateral), aggravating factors (overhead motion, night pain), duration 4, 3
• Red flags: Fever, weight loss, history of malignancy, neurologic symptoms requiring urgent evaluation 5
• Functional limitations: Weakness, restricted range of motion, instability symptoms 6, 3

Perform specific provocative maneuvers:

• Empty can test and external rotation strength testing for rotator cuff pathology 6, 3
• Hawkins-Kennedy and Neer impingement signs for subacromial impingement 6, 3
• Cross-body adduction test for acromioclavicular joint pathology 3
• Apprehension and relocation tests for glenohumeral instability 3
• Passive range of motion assessment to differentiate adhesive capsulitis (restricted passive ROM) from rotator cuff disorders (preserved passive ROM) 3

Imaging Algorithm

Step 1: Plain Radiographs (Always First)

Obtain standard shoulder radiographs in every patient with shoulder pain, even when soft tissue injury appears clinically obvious. 1, 2 Radiographs may reveal:

• Fractures, dislocations, or arthritis that fundamentally alter management 2
• Massive rotator cuff tears (superior humeral head migration) 3
• Calcific tendinitis or acromioclavicular joint pathology 3

Step 2: Advanced Imaging Based on Clinical Scenario

If radiographs are normal or nondiagnostic:

For Suspected Rotator Cuff Pathology

MRI shoulder without IV contrast is the gold standard for evaluating rotator cuff tears, labral pathology, and other soft tissue injuries. 1, 2, 6

• MRI demonstrates 90-91% sensitivity and 93-95% specificity for full-thickness rotator cuff tears 2, 6
• MRI is preferred when evaluating patients with large body habitus, restricted range of motion from acute pain, or suspicion of multiple intra-articular pathologies 1, 2
• Do not routinely use IV contrast—there is no evidence supporting its use in standard shoulder pain evaluation 2

Ultrasound is an acceptable alternative with comparable accuracy (90-91% sensitivity, 93-95% specificity) for full-thickness rotator cuff tears, particularly when: 1, 2, 6

• Metallic hardware is present causing MRI artifact 1, 2
• MRI is unavailable or contraindicated 1

Caveat: Ultrasound performance for partial-thickness tears is highly operator-dependent and more variable; MRI remains preferred for suspected partial tears 1, 2, 6

For Suspected Occult Fracture

CT shoulder without IV contrast provides superior detection of subtle nondisplaced fractures with high spatial resolution 1, 2

MRI without IV contrast can demonstrate bone marrow edema from occult fracture and simultaneously assess soft tissue injuries 1, 2

For Confirmed Fracture on Radiographs

CT shoulder without IV contrast is mandatory to delineate fracture planes and guide surgical planning 1, 2

For Suspected Dislocation or Instability

MRI shoulder without IV contrast is first-line because post-traumatic joint effusion or hemarthrosis provides natural contrast for soft tissue visualization 1, 2

• CT without contrast may be added if MRI inadequately assesses bone loss 1
• Defer MR arthrography to the subacute phase (>2 weeks post-injury) when natural effusion has resolved and detailed labral evaluation is needed 1, 2, 6

Common pitfall: Do not perform arthrography in acute trauma—natural joint effusion makes it unnecessary and potentially harmful 2

Management Strategy

Conservative Treatment (First-Line for Most Conditions)

Initiate a trial of non-operative management for rotator cuff tendinopathy, partial-thickness tears with preserved strength and range of motion, and adhesive capsulitis. 6, 5

Pharmacologic Management

• NSAIDs (oral non-steroidal anti-inflammatory drugs) for pain control 6, 5
• Acetaminophen as an alternative analgesic 5
• Subacromial corticosteroid injections: Evidence is inconclusive—Level II trials show no significant advantage over lidocaine alone at 6 weeks, though Level IV case series report modest short-term relief 6

Physical Therapy

Structured rehabilitation emphasizing therapeutic exercises is recommended for all shoulder pain disorders. 6, 5

For rotator cuff pathology with scapular dyskinesis:

• Reduce excessive upper trapezius activation 6
• Strengthen middle and lower trapezius fibers 6
• Correct scapular positioning and movement patterns 6

Activity modification: Avoid aggravating overhead loading during the acute phase 6

Surgical Referral Indications

Consider surgical consultation if:

• Full-thickness rotator cuff tear is confirmed on imaging 6
• Symptoms persist beyond 3-6 months despite appropriate conservative management 6
• Progressive functional deterioration develops (new weakness, loss of motion) 6
• Complex fracture requiring operative fixation 1, 2
• Recurrent glenohumeral instability with documented dislocation events 3

Expected Outcomes

With diligent conservative management emphasizing scapular rehabilitation, the majority of partial-thickness rotator cuff injuries and rotator cuff tendinopathy improve within 6-12 weeks. 6

Important caveat: Preserved range of motion and strength do not exclude clinically significant pathology—partial-thickness tears can cause substantial pain and functional limitation despite normal examination findings 6