Pyogenic Osteomyelitis Overview

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Questions and Answers

Which of the following bacteria is the most common causative agent of acute osteomyelitis?

  • Borrelia burgdorferi
  • Escherichia coli
  • Staphylococcus aureus (correct)
  • Haemophilus influenzae

What is the term used for the non-viable, necrotic bone that forms as a result of acute osteomyelitis?

  • Sequestrum (correct)
  • Periosteum
  • Involucrum
  • Suppurative arthritis

Which of the following is NOT a route of infection for acute osteomyelitis?

  • Transmission through a tick bite (correct)
  • Traumatic implantation after compound fractures or orthopedic procedures
  • Hematogenous dissemination
  • Extension from an adjacent joint or soft tissue infection

Which of the following is a common causative agent of acute osteomyelitis in neonates?

<p>Group B streptococci (B)</p> Signup and view all the answers

What is the term used for the inflammatory reaction that leads to the formation of a sequestrum in acute osteomyelitis?

<p>Acute inflammatory reaction (D)</p> Signup and view all the answers

What is the dominant feature of late-stage Lyme disease?

<p>Chronic arthritis (D)</p> Signup and view all the answers

What is the mechanism by which Lyme arthritis may be caused?

<p>Immune responses against Borrelia antigens that cross-react with joint proteins (D)</p> Signup and view all the answers

Which of the following is a characteristic of the histologic examination of Lyme arthritis?

<p>Chronic papillary synovitis with synoviocyte hyperplasia and mononuclear cell infiltrates (B)</p> Signup and view all the answers

Which of the following is a risk factor for the development of osteonecrosis (avascular necrosis) in Lyme disease?

<p>Steroid administration (D)</p> Signup and view all the answers

Which of the following is the most important diagnostic tool for Lyme arthritis?

<p>Serologic studies (C)</p> Signup and view all the answers

Which of the following is the main causative agent of suppurative arthritis in older children and adults?

<p>Staphylococcus aureus (D)</p> Signup and view all the answers

In the early disseminated stage of Lyme disease, which of the following can occur?

<p>Secondary annular skin lesions, lymphadenopathy, migratory joint and muscle pain, cardiac arrhythmias, and meningitis, often with cranial nerve involvement (A)</p> Signup and view all the answers

Which of the following is the most common causative agent of suppurative arthritis in children younger than 2 years of age?

<p>Haemophilus influenzae (C)</p> Signup and view all the answers

What is the main reason why infectious arthritis is considered serious?

<p>It can cause rapid joint destruction and permanent deformities (C)</p> Signup and view all the answers

Which of the following is a characteristic radiologic finding of infectious arthritis?

<p>A destructive lytic focus surrounded by edema and a sclerotic rim (B)</p> Signup and view all the answers

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