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Emergency and Acute Medicine: Sternoclavicular Joint Injury
The sternoclavicular joint (SCJ) is the only articulation connecting the upper limb to the axial skeleton, making it a critical but relatively uncommon site of injury. Stability of this joint depends largely on surrounding ligaments, including the anterior and posterior sternoclavicular ligaments, interclavicular ligament, and costoclavicular ligament. Injuries to the SCJ are rare and typically result from high-energy trauma such as motor vehicle collisions or athletic impacts. They may present as sprains, subluxations, or complete dislocations.
SCJ injuries occur when ligamentous structures are stressed or disrupted. In sprains, the joint capsule remains intact, while subluxation involves partial ligament rupture with preserved costoclavicular support. Complete ligament disruption leads to dislocation, which may be anterior or posterior depending on the direction of force and shoulder position at the time of injury. Anterior dislocations are far more common, accounting for over 90% of cases, and typically result from a posteriorly directed force to the shoulder. Posterior dislocations are less common but far more dangerous, often resulting from direct trauma to the medial clavicle or force transmitted through the shoulder. These can compress vital mediastinal structures, including the trachea, esophagus, and major vessels, making them surgical emergencies.
Patients usually present with localized pain and swelling over the medial clavicle, often holding the affected arm across the chest. Movement of the shoulder is limited, particularly abduction and external rotation. In anterior dislocations, the medial clavicle is visibly prominent and palpable. Posterior dislocations may be more difficult to detect due to swelling but may present with concerning symptoms such as difficulty breathing or swallowing, hoarseness, or signs of vascular compromise. A thorough neurovascular and airway assessment is essential in all suspected cases.
Diagnosis can be challenging with plain radiographs, as the SCJ is poorly visualized. Chest x-rays may appear normal, so a high index of suspicion is required. CT scanning is the imaging modality of choice, as it clearly defines the position of the clavicle and can identify associated injuries to surrounding structures. Ultrasound may be useful in the emergency setting, particularly in unstable patients, while MRI can provide additional detail regarding soft tissue and ligamentous injuries.
Management depends on the severity and type of injury. Sprains and subluxations are typically treated conservatively with rest, analgesia, and sling immobilization. Anterior dislocations may be reduced in the emergency department using traction and positioning techniques under procedural sedation, though recurrence is common and residual deformity is usually cosmetic. Posterior dislocations, however, require urgent reduction—preferably in the operating room with orthopedic and thoracic surgical support due to the risk of life-threatening complications. In emergencies where airway or vascular compromise is present and surgical support is unavailable, reduction may need to be attempted in the ED.
Patients with posterior dislocations or associated complications require hospital admission for monitoring and further management. Those with uncomplicated anterior dislocations or minor injuries may be discharged with appropriate immobilization and close orthopedic follow-up. Activity restriction is important during recovery, and high-risk activities should be avoided for several months.
A key pitfall is missing posterior dislocations, which may be mistaken for anterior injuries due to swelling. In children, injuries to the growth plate can mimic SCJ dislocations. Because of the potential for severe complications, especially with posterior dislocations, early recognition and specialist involvement are critical for optimal outcomes.
The sternoclavicular joint (SCJ) is the only articulation connecting the upper limb to the axial skeleton, making it a critical but relatively uncommon site of injury. Stability of this joint depends largely on surrounding ligaments, including the anterior and posterior sternoclavicular ligaments, interclavicular ligament, and costoclavicular ligament. Injuries to the SCJ are rare and typically result from high-energy trauma such as motor vehicle collisions or athletic impacts. They may present as sprains, subluxations, or complete dislocations.
SCJ injuries occur when ligamentous structures are stressed or disrupted. In sprains, the joint capsule remains intact, while subluxation involves partial ligament rupture with preserved costoclavicular support. Complete ligament disruption leads to dislocation, which may be anterior or posterior depending on the direction of force and shoulder position at the time of injury. Anterior dislocations are far more common, accounting for over 90% of cases, and typically result from a posteriorly directed force to the shoulder. Posterior dislocations are less common but far more dangerous, often resulting from direct trauma to the medial clavicle or force transmitted through the shoulder. These can compress vital mediastinal structures, including the trachea, esophagus, and major vessels, making them surgical emergencies.
Patients usually present with localized pain and swelling over the medial clavicle, often holding the affected arm across the chest. Movement of the shoulder is limited, particularly abduction and external rotation. In anterior dislocations, the medial clavicle is visibly prominent and palpable. Posterior dislocations may be more difficult to detect due to swelling but may present with concerning symptoms such as difficulty breathing or swallowing, hoarseness, or signs of vascular compromise. A thorough neurovascular and airway assessment is essential in all suspected cases.
Diagnosis can be challenging with plain radiographs, as the SCJ is poorly visualized. Chest x-rays may appear normal, so a high index of suspicion is required. CT scanning is the imaging modality of choice, as it clearly defines the position of the clavicle and can identify associated injuries to surrounding structures. Ultrasound may be useful in the emergency setting, particularly in unstable patients, while MRI can provide additional detail regarding soft tissue and ligamentous injuries.
Management depends on the severity and type of injury. Sprains and subluxations are typically treated conservatively with rest, analgesia, and sling immobilization. Anterior dislocations may be reduced in the emergency department using traction and positioning techniques under procedural sedation, though recurrence is common and residual deformity is usually cosmetic. Posterior dislocations, however, require urgent reduction—preferably in the operating room with orthopedic and thoracic surgical support due to the risk of life-threatening complications. In emergencies where airway or vascular compromise is present and surgical support is unavailable, reduction may need to be attempted in the ED.
Patients with posterior dislocations or associated complications require hospital admission for monitoring and further management. Those with uncomplicated anterior dislocations or minor injuries may be discharged with appropriate immobilization and close orthopedic follow-up. Activity restriction is important during recovery, and high-risk activities should be avoided for several months.
A key pitfall is missing posterior dislocations, which may be mistaken for anterior injuries due to swelling. In children, injuries to the growth plate can mimic SCJ dislocations. Because of the potential for severe complications, especially with posterior dislocations, early recognition and specialist involvement are critical for optimal outcomes.
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