Shoulder Joint Examination and Management Algorithm for NAC OSCE Canada
For the NAC OSCE shoulder examination, begin with plain radiographs as your initial imaging for any shoulder pain presentation, then proceed to MRI without contrast for soft tissue pathology or CT without contrast for fracture characterization based on clinical findings. 1
Initial Clinical Assessment Framework
History Components
- Mechanism of injury: Trauma vs. atraumatic onset
- Pain characteristics: Location (anterior/posterior/lateral), radiation patterns, aggravating movements
- Functional limitations: Specific activities affected (reaching overhead, behind back, lifting)
- Red flags: Night pain, constitutional symptoms, progressive weakness
- Previous shoulder problems: Prior dislocations, surgeries, chronic instability
Physical Examination Sequence
Inspection
- Asymmetry, muscle atrophy (supraspinatus/infraspinatus fossae)
- Deformity suggesting dislocation or fracture
- Swelling or ecchymosis
Palpation
- AC joint tenderness
- Bicipital groove tenderness
- Greater tuberosity tenderness
Range of Motion (Active then Passive)
- Forward flexion (normal 180°)
- Abduction (normal 180°)
- External rotation at side (normal 45°)
- Internal rotation (document vertebral level reached)
Specific Provocative Tests
- Rotator cuff: Empty can test (supraspinatus), external rotation resistance (infraspinatus/teres minor), lift-off test (subscapularis)
- Impingement: Neer sign, Hawkins-Kennedy test
- Instability: Apprehension test, relocation test, load-and-shift test
- Labral pathology: O'Brien test, anterior slide test
Imaging Algorithm
Step 1: Initial Imaging
Plain radiographs are mandatory for ALL acute shoulder pain presentations 1
- Standard views: AP, scapular Y, axillary lateral
- Purpose: Rule out fracture, dislocation, arthritis, calcific tendinitis
Step 2: Advanced Imaging Based on Clinical Scenario
Scenario A: Suspected Occult Fracture (Normal/Nonspecific X-rays)
- First choice: CT shoulder without contrast OR MRI shoulder without contrast 1
- CT provides superior osseous detail for subtle nondisplaced fractures
- MRI demonstrates bone marrow edema and identifies associated soft tissue injuries
Scenario B: Confirmed Fracture on X-ray
- First choice: CT shoulder without contrast 1
- Essential for surgical planning of complex proximal humerus, scapular, or clavicle fractures
- Exception: If rotator cuff injury assessment needed in non-surgical candidates, use MRI without contrast
Scenario C: Dislocation/Instability on Examination
- First choice: MRI shoulder without contrast 1
- Post-traumatic effusion/hemarthrosis provides natural contrast for soft tissue visualization
- CT without contrast is appropriate when bone loss assessment is critical
- MR arthrography reserved for detailed labral evaluation in subacute/chronic cases
Scenario D: Suspected Labral Tear
- Acute setting: MRI shoulder without contrast (traumatic effusion acts as contrast) 1
- Subacute/chronic setting: MR arthrography or CT arthrography (joint effusion insufficient for adequate distention)
Scenario E: Suspected Rotator Cuff Tear
- First choice: MRI shoulder without contrast OR ultrasound 1
- Both modalities show 90-91% sensitivity and 93-95% specificity for full-thickness tears 1
- Choose MRI when: Large body habitus, restricted ROM from acute pain, suspicion of concurrent labral pathology
- Choose ultrasound when: Metallic hardware present causing MRI artifacts
Management Pathways
Non-Surgical Indications
- Partial-thickness rotator cuff tears
- Mild-moderate glenohumeral osteoarthritis
- Impingement syndrome without structural pathology
- Stable labral tears in low-demand patients
Treatment approach:
- Physical therapy focusing on rotator cuff strengthening and scapular stabilization
- NSAIDs for pain control
- Corticosteroid injections for persistent symptoms (avoid in young patients with instability)
Surgical Indications
- Full-thickness rotator cuff tears in functional candidates
- Recurrent shoulder dislocations (>2 episodes)
- Displaced fractures requiring fixation
- Failed conservative management after 3-6 months
For glenohumeral osteoarthritis specifically 2:
- Total shoulder arthroplasty preferred over hemiarthroplasty (moderate-strength recommendation)
- Contraindication: Irreparable rotator cuff tear (consensus recommendation)
- Surgeon volume matters: Avoid surgeons performing <2 shoulder arthroplasties/year
Critical Pitfalls to Avoid
Never skip plain radiographs: Even with obvious clinical findings, fractures and dislocations require radiographic confirmation 1
MR arthrography timing error: Do not order MR arthrography in acute trauma—natural joint effusion provides adequate contrast 1
Ultrasound limitations: Operator-dependent and unreliable for partial-thickness tears; interobserver agreement is poor for anything except full-thickness tears 1
Missing associated injuries: Anterior dislocations commonly cause Hill-Sachs lesions (humeral head) and Bankart lesions (glenoid labrum)—MRI captures both 1
Rotator cuff in elderly fractures: Consider MRI even with fractures in older patients not planned for surgery, as rotator cuff tears affect rehabilitation and prognosis 1
NAC OSCE-Specific Considerations
The NAC examination emphasizes systematic, reproducible clinical skills assessment 3. Your approach must demonstrate:
- Structured examination technique: Follow the inspection-palpation-ROM-special tests sequence consistently
- Appropriate imaging selection: Justify choices based on clinical findings, not shotgun ordering
- Clear communication: Explain findings and management rationale to standardized patients
- Safety awareness: Recognize when immediate intervention (reduction of dislocation) versus imaging takes priority
The examination scoring emphasizes both technical competence and clinical reasoning—demonstrating why you chose specific tests and imaging modalities is as important as performing them correctly 3, 4.