Clavicle fractures are generally classified into three main groups based on their anatomical location: the middle third (midshaft), the lateral third (distal), and the medial third (proximal).
Midshaft Clavicle Fractures (Group I)¶
Fractures of the middle third are the most common type, accounting for 69% to 82% of all clavicle injuries. They typically occur due to a direct blow to the shoulder or a fall, as this area lacks the strong muscular or ligamentous attachments found at the ends of the bone.
Knowledge Check
Midshaft clavicle fractures are the most common type, accounting for 69-82% of all clavicle injuries. This region lacks strong muscular or ligamentous attachments, making it vulnerable to injury.
• Classification: These are often categorised using the Edinburgh or Robinson systems. The Edinburgh system labels them as Type II, while the Robinson system classifies them as Type 2, further subdivided into 2a (undisplaced) and 2b (displaced), with 2b further split into simple, wedge comminution, or segmental patterns.
Treatment Options:¶
◦ Conservative: This is the standard of care for undisplaced or minimally displaced fractures, involving sling immobilisation for 2--6 weeks followed by rehabilitation.
◦ Surgical: Operative intervention is increasingly recommended for completely displaced fractures, those with shortening >2 cm, or significant comminution, especially in athletic or high-demand patients.
◦ Fixation Methods: Options include single-plate fixation (superior or anteroinferior positioning), dual-plate fixation (using smaller, orthogonally placed mini-fragment plates), or intramedullary (IM) nailing with titanium elastic nails.
Lateral/Distal Clavicle Fractures (Group II)¶
These involve the lateral third of the bone and represent approximately 10% to 30% of all fractures. Management is heavily influenced by the integrity of the coracoclavicular (CC) ligaments, which dictate fracture stability.
• Classification (Neer Classification):
◦ Type I: Stable fractures occurring lateral to intact CC ligaments.
◦ Type II: Unstable fractures where the CC ligaments are detached from the medial fragment; subdivided into IIA (fracture medial to ligaments) and IIB (ligaments ruptured or between fracture lines).
Knowledge Check
Displaced Type II and V lateral clavicle fractures have high non-union rates (28-44%) with conservative management, which is why operative treatment is often recommended for these patterns.
◦ Type III: Intra-articular fractures involving the acromioclavicular (AC) joint.
◦ Type IV: Physeal fractures in skeletally immature patients.
◦ Type V: Comminuted fractures where the CC ligaments are attached to a separate fragment.
Treatment Options:¶
◦ Conservative: Stable Type I, III, and IV fractures are typically managed non-operatively with a sling and gradual range-of-motion exercises.
◦ Surgical: Displaced Type II and V patterns are often treated operatively due to high rates of non-union (up to 28%--44%) with conservative management.
◦ Fixation Methods: Surgical techniques include locking plates, hook plates (for very small or comminuted fragments), CC suture fixation (using anchors or buttons), and trans-osseous suturing.
Medial/Proximal Clavicle Fractures (Group III)¶
These are the least common, representing less than 5% of all clavicle fractures. In patients under 25, these are often growth plate injuries because the medial physis is the last to close.
Knowledge Check
Medial/proximal clavicle fractures are the least common type, representing less than 5% of all clavicle fractures. In patients under 25, these often involve growth plate injuries.
• Classification: These are classified by displacement and whether they are extra-articular or intra-articular.
Treatment Options:¶
◦ Conservative: Most medial fractures, including anterior dislocations, are treated non-operatively with a sling and rest, as remodelling potential is high in younger athletes.
◦ Surgical: Surgery is reserved for rare cases involving posterior displacement that risks damage to vital mediastinal structures (vascular injury or impingement) or severe displacement causing symptomatic instability
Summary of Clavicle Fracture Types and Management¶
| Fracture Type | Epidemiology | Management Options | Pros and Cons |
|---|---|---|---|
| Midshaft (Group I/Type 2) | Most common pattern, accounting for 69%--82% of all clavicle fractures. Frequently occurs in adolescent males (aged 10--19) and contact sport athletes. | Non-operative: Sling immobilisation for 2--6 weeks (standard for undisplaced/minimally displaced). Surgical: Plate fixation (superior, anterior, or dual) or Intramedullary (IM) nailing for displaced or comminuted fractures. |
Pros (Surgical): Lower non-union rates, faster return to sport (RTS), and improved shoulder function in athletes. Cons (Surgical): Risk of infection, neurovascular injury, and symptomatic hardware (up to 67% removal rate). |
| Lateral/Distal (Group II/Type 3) | Represents 10%--30% of clavicle fractures. Often caused by a direct blow to the lateral shoulder. | Non-operative: Sling for stable patterns (Neer Types I, III, IV). Surgical: Locking plates, hook plates, or coracoclavicular (CC) ligament reconstruction for unstable/displaced patterns (Types II, V). |
Pros: Surgery addresses high non-union rates (28%--44%) associated with conservative management of unstable patterns. Cons: Hook plates can cause acromial erosion or rotator cuff impingement; highest rate of secondary intervention. |
| Medial/Proximal (Group III/Type 1) | Least common, accounting for less than 5% of fractures. Often involve growth plate injuries in patients under 25. | Non-operative: Standard treatment for most, including anterior dislocations, due to high remodelling potential. Surgical: Reserved for rare posterior displacement risking vital mediastinal structures (e.g., vascular injury). |
Pros: Conservative management is typically successful with 100% RTP rates. Cons: Posterior injuries are potentially life-threatening if missed; surgery is technically demanding due to proximity to the heart and lungs. |
General Epidemiological and Clinical Insights## General Epidemiological and Clinical Insights¶
• High-Risk Groups: Clavicle fractures comprise roughly 10% of all sports-related fractures. Male athletes are disproportionately affected, often at a rate 3 to 5 times higher than females.
• Sport-Specific Risk: The highest incidence occurs in football, soccer, cycling, snowboarding, and ice hockey.
• Return to Play (RTP): The overall RTP rate for athletes is high at 91%--92%. For displaced midshaft fractures, surgical intervention reduces the time missed by approximately 12 weeks compared to conservative treatment (9.4 weeks vs 21.5 weeks).
• Surgical Trends: There has been a reported 300% to 700% increase in the rate of operative fixation over the last two decades, driven by improved functional outcomes in active populations
Knowledge Check
There has been a dramatic 300-700% increase in operative fixation rates over the last two decades, driven by improved functional outcomes in active populations, particularly for displaced midshaft fractures.