Which of the following is the most common early systemic complication of long bone fractures?

Question

Accepted Answer

A. Fat embolism syndrome. ## Early Systemic Complications of Long Bone Fractures

**Key Point:** Fat embolism syndrome (FES) is the most common early systemic complication, occurring within 24–72 hours of long bone fracture, particularly femur, tibia, and pelvis.

### Pathophysiology
Fat embolism occurs when marrow fat enters the venous circulation through:
1. Disrupted medullary vessels at fracture site
2. Increased intramedullary pressure forcing fat globules into systemic circulation
3. Mechanical obstruction and chemical injury to pulmonary capillaries

### Clinical Features of FES
- **Respiratory:** dyspnea, tachypnea, hypoxemia (PaO₂ < 60 mmHg)
- **Neurological:** confusion, restlessness, altered consciousness (petechial rash on conjunctiva and axillae)
- **Cutaneous:** petechial rash (pathognomonic but late sign)
- **Timing:** typically 12–72 hours post-injury

### Diagnostic Criteria (Gurd's Criteria)
**Major criteria (need ≥1):**
  - Petechial rash
  - Respiratory symptoms with hypoxemia
  - Cerebral symptoms

**Minor criteria (need ≥4):**
  - Tachycardia > 110 bpm
  - Fever > 38.5°C
  - Retinal changes (cotton-wool spots)
  - Jaundice
  - Renal changes (lipiduria)
  - Thrombocytopenia
  - ESR elevation

**High-Yield:** FES is more common with multiple fractures, pelvic fractures, and delayed fracture stabilization. Early fixation reduces FES incidence.

**Clinical Pearl:** The classic triad is respiratory distress + petechial rash + altered mental status, but rash may be absent in mild cases.

### Management
- Supportive care (oxygen, mechanical ventilation if needed)
- Early fracture stabilization (reduces fat release)
- Corticosteroids (controversial but used in severe cases)
- Prophylaxis: early mobilization, adequate hydration

[cite:Rockwood & Green's Fractures in Adults Ch 1]

![Complications of Fractures diagram](https://mmcphlazjonnzmdysowq.supabase.co/storage/v1/object/public/blog-images/explanation/4184.webp)

Answer

B. Acute respiratory distress syndrome

Answer

C. Disseminated intravascular coagulation

Answer

D. Pulmonary thromboembolism

Which of the following is the most common early systemic complication of long bone fractures?

Explanation

Early Systemic Complications of Long Bone Fractures

Pathophysiology

Clinical Features of FES

Diagnostic Criteria (Gurd's Criteria)

Management

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