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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?

Group B streptococci 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?

Acute inflammatory reaction Signup and view all the answers

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

Chronic arthritis Signup and view all the answers

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

Immune responses against Borrelia antigens that cross-react with joint proteins Signup and view all the answers

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

Chronic papillary synovitis with synoviocyte hyperplasia and mononuclear cell infiltrates Signup and view all the answers

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

Steroid administration Signup and view all the answers

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

Serologic studies Signup and view all the answers

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

Staphylococcus aureus Signup and view all the answers

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

Secondary annular skin lesions, lymphadenopathy, migratory joint and muscle pain, cardiac arrhythmias, and meningitis, often with cranial nerve involvement 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?

Haemophilus influenzae Signup and view all the answers

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

It can cause rapid joint destruction and permanent deformities Signup and view all the answers

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

A destructive lytic focus surrounded by edema and a sclerotic rim Signup and view all the answers