BONE AND JOINT INFECTION

Question 0

How do bones most often become infected?

Answer 0

Through haematogenous spread.

Question 1

Define osteomyelitis.

Answer 1

Infection of bone

Question 2

By what other means can bacteria or microorganisms reach bone?

Answer 2

Spread from soft tissue such as cellulitis

Direct inoculation - in surgery

Question 3

Name 7 features of haematogenous OM?

Answer 3

Pus
Oedema
Congestion
Abscess
Sequestrum (dead bone)
Involucrum (new bone)
Sinus

Question 4

What is the most common organism responsible for osteomyelitis in all age groups?

Answer 4

Staph aureus

Question 5

How soon after the intial symptoms of infection will the infection be clear through imaging?

Answer 5

About 2 weeks

Question 6

What are you looking for on a radiograph?

Answer 6

Lucency

Question 7

What is spondylodiscitis?

Answer 7

Infection of a vertebral disc

Question 8

How long should a course of antibiotics be for someone that presents with acute osteomyelitis?

Answer 8

6 weeks

Question 9

How long should the course of antibiotics be for someone who presents with chronic osteomyelitis?

Answer 9

12 weeks

Question 10

How long should a course of antibiotics be for a child who presents with osteomyelitis?

Answer 10

2-4 weeks

Question 11

Define septic arthritis.

Answer 11

Infection of the synovium.

Question 12

What is the organism which underlies most cases of septic arthirtis?

Answer 12

Staph aureus.

Question 13

What are the surgical treatment options for septic arthritic patients?

Answer 13

Aspirate
Arthroscopic drainage
Open washout

Question 14

What is the infection rate for primary intervention procedures?

Answer 14

1.5 - 2.5%

Question 15

What are the organisms most often responsible for an infection of a prosthetic joint?

Answer 15

Staph epidermidis and aureus.

Question 16

What are you likely to see on a radiograph that might help diagnose prosthetic joint infection?

Answer 16

Lucency in the bone around the prosthesis.