NCLEX Review Guide: Pediatric Osteomyelitis

Definition and Etiology

• Osteomyelitis is an infection of the bone and bone marrow, most commonly caused by Staphylococcus aureus in children.
• In children, infection typically spreads through the hematogenous route from distant sites like respiratory or skin infections.
• The metaphysis of long bones (especially femur, tibia, humerus) are most commonly affected due to rich blood supply and slower circulation.

Signs and Symptoms

• Acute onset of severe bone pain that worsens with movement and is often described as deep, constant, and throbbing.
• Systemic signs include fever, malaise, irritability, and in infants, poor feeding and failure to move affected extremity.
• Local signs include swelling, warmth, erythema, and tenderness over the affected bone area.
• Child may exhibit pseudoparalysis or refusal to bear weight on affected limb.

Laboratory and Imaging

• Blood cultures are essential and positive in 50-60% of cases; obtain before antibiotic administration.
• Laboratory findings include elevated WBC count, ESR, and CRP with ESR remaining elevated longer than CRP during treatment.
• X-rays may be normal initially; bone changes appear 10-14 days after infection onset.
• MRI is the gold standard for early detection and can identify infection within 24-48 hours.

Antibiotic Therapy

1. Initiate empirical IV antibiotics immediately after blood cultures are obtained
2. First-line treatment is usually nafcillin or clindamycin for suspected staph aureus
3. Continue IV antibiotics for minimum 5-7 days until clinical improvement
4. Transition to oral antibiotics for total treatment duration of 4-6 weeks

Nursing Interventions

• Implement strict aseptic technique for all procedures and maintain isolation precautions as ordered.
• Provide pain management with scheduled analgesics and comfort measures like positioning and heat/cold therapy.
• Monitor for complications including sepsis, pathologic fractures, and growth disturbances.
• Educate family about medication compliance and importance of completing full antibiotic course.

Potential Complications

• Growth plate damage can result in limb length discrepancies and angular deformities, especially in children under 2 years.
• Chronic osteomyelitis may develop if treatment is delayed or inadequate, requiring prolonged therapy.
• Pathologic fractures can occur through weakened bone, requiring surgical intervention.
• Systemic complications include sepsis and metastatic infections to other organs.