Surgery

osteomyelitis

Q: What is the most common overall pathogen causing osteomyelitis?

Staphylococcus aureus is listed as the #1 overall pathogen causing osteomyelitis. MRSA is also increasingly common as a causative organism.

Q: What is the term for necrotic, devitalized bone fragment in chronic osteomyelitis?

Sequestrum refers to necrotic, devitalized bone fragment. Involucrum is the new periosteal bone that forms around the sequestrum.

Q: In children, why does osteomyelitis preferentially affect the metaphysis?

Hair-pin end-arterioles in the metaphysis have slow, low-pressure flow that traps bacteria. Additionally, the avascular growth plate confines infection and loose periosteum allows pus to lift it.

Q: What is the duration criterion for classifying osteomyelitis as chronic?

Chronic osteomyelitis is defined as infection lasting greater than 6 weeks. It is characterized by the presence of sequestrum and sinus tracts.

Q: Which pathogen should be specifically considered in patients with sickle cell disease who develop osteomyelitis?

In sickle cell disease, Salmonella is a special consideration for osteomyelitis, though S. aureus remains the #1 pathogen even in this population.

Osteomyelitis is an infection of bone caused by bacterial pathogens, most commonly Staphylococcus aureus, which can spread through hematogenous seeding in children or direct inoculation and contiguous spread in adults. The condition is clinically significant because it can progress from acute to chronic infection with sequestrum formation, leading to persistent sinus tracts, antibiotic resistance, and complications including sepsis, growth arrest in children, and limb amputation in diabetic patients. Medical students must recognize that early diagnosis is critical since X-ray changes appear only after 5-10 days, that hip osteomyelitis should be presumed to be septic arthritis until proven otherwise, and that chronic osteomyelitis requires surgical management as antibiotics alone cannot cure established infection.

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1. What is the most common overall pathogen causing osteomyelitis?

2. What is the term for necrotic, devitalized bone fragment in chronic osteomyelitis?

3. In children, why does osteomyelitis preferentially affect the metaphysis?

4. What is the duration criterion for classifying osteomyelitis as chronic?

5. Which pathogen should be specifically considered in patients with sickle cell disease who develop osteomyelitis?

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