How should an adult with recent blunt trauma presenting with medial clavicle pain, swelling, and limited shoulder motion suggestive of a sternoclavicular joint injury be evaluated and managed?

Sternoclavicular Joint Injury: Evaluation and Management

An adult with recent blunt trauma presenting with medial clavicle pain, swelling, and limited shoulder motion should undergo immediate CT imaging to confirm sternoclavicular joint injury direction and severity, followed by urgent closed reduction for posterior dislocations due to life-threatening mediastinal structure compression risk.

Initial Clinical Assessment

Critical History Elements

• Document the exact mechanism of injury, including direction of force, whether direct or indirect trauma, and kinetic energy involved 1, 2
• Record time of injury and symptom evolution, as posterior dislocations can develop life-threatening complications hours after initial injury 3
• Immediately assess for red-flag symptoms indicating posterior dislocation: dyspnea, dysphagia, cyanosis, ipsilateral arm swelling, paresthesias, or venous congestion of the neck 3
• Note any sensation of joint instability, clicking, or grinding with shoulder movement 1

Physical Examination Priorities

• Palpate the medial clavicle to determine displacement direction: anterior displacement creates a visible/palpable prominence, while posterior displacement creates a depression or asymmetry 1, 2
• Assess neurovascular status of the ipsilateral upper extremity, including radial pulse strength, capillary refill, and sensation 3
• Evaluate for signs of mediastinal compression: stridor, hoarseness, difficulty swallowing, or jugular venous distension 3
• Test active and passive shoulder range of motion, documenting specific limitations 1

Diagnostic Imaging Algorithm

First-Line Imaging

• Plain radiographs are inadequate and frequently miss sternoclavicular joint injuries 4
• CT scan is the diagnostic modality of choice and must be obtained to confirm injury direction, assess severity, and identify associated mediastinal injuries 2, 3, 4
• CT provides accurate visualization of dislocation direction (anterior vs. posterior), degree of displacement, and any coexisting fractures 2, 3

Age-Specific Imaging Considerations

• In patients under 23-25 years, MRI may be needed to differentiate physeal fracture from true sternoclavicular dislocation, as the medial clavicular physis remains open until approximately age 25 2, 3
• Physeal injuries are more common than true dislocations in skeletally immature patients 5

Management Based on Injury Pattern

Anterior Sternoclavicular Dislocation

• Attempt closed reduction as the primary intervention, though recurrence rates are high 2, 5
• Closed reduction technique: patient supine with a bolster between scapulae, apply traction to the abducted arm with posterior pressure on the medial clavicle 2
• If closed reduction fails or redislocation occurs, proceed to surgical reconstruction based on individual patient factors including pain severity, functional deficit, and activity demands 2
• Non-operative management with sling immobilization and symptom control is acceptable for stable anterior dislocations in low-demand patients 1, 5

Posterior Sternoclavicular Dislocation

• This is a surgical emergency requiring immediate closed reduction due to risk of tracheal compression, esophageal injury, great vessel injury, or pneumothorax 1, 2, 3
• Closed reduction should be attempted urgently, ideally in the operating room with cardiothoracic surgery backup available 2, 3
• Closed reduction technique: patient supine with bolster between scapulae, apply traction to the abducted arm with anterior pressure on the posterior clavicle, or use towel clip to grasp the medial clavicle and pull anteriorly 2, 3
• If closed reduction fails, open reduction and stabilization are mandatory 2, 5
• Post-reduction CT should be obtained to confirm anatomic reduction and rule out mediastinal injury 3

Physeal Injuries (Age <25 Years)

• Attempt closed reduction for displaced physeal fractures 2, 5
• For anterior physeal displacement with failed closed reduction or recurrent instability, open reduction and internal fixation with absorbable sutures is indicated—this differs from adult management 5
• Posterior physeal injuries often require open stabilization if closed reduction fails 2, 5
• Non-operative treatment after successful reduction generally leads to good functional outcomes due to remodeling potential 2

Post-Reduction Management

Immobilization Protocol

• Sling immobilization for 4-6 weeks following successful reduction 1
• Avoid activities that stress the sternoclavicular joint (pushing, pulling, overhead lifting) for 3 months 1

Rehabilitation

• Begin gentle range-of-motion exercises at 4-6 weeks post-injury 1
• Progress to strengthening exercises at 8-12 weeks based on pain and stability 1

Chronic Instability Management

• Surgical intervention for chronic sternoclavicular instability is indicated only when persistent pain or functional deficit significantly impacts quality of life 2
• Medial clavicle resection is an effective option for post-traumatic arthritis, provided costoclavicular ligaments are intact or reconstructed 2

Critical Pitfalls to Avoid

• Failing to obtain CT imaging—plain radiographs miss the majority of sternoclavicular injuries and cannot reliably determine dislocation direction 4
• Delaying reduction of posterior dislocations, which increases risk of mediastinal structure injury 3
• Missing life-threatening complications that can develop hours after initial posterior dislocation 3
• Treating physeal injuries in patients under 25 years as true dislocations without considering age-appropriate management 2, 5
• Inadequate neurovascular examination documentation, particularly in high-energy trauma 3