Microbiology 12 - Wound, bone and joint infections Flashcards Preview

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Flashcards in Microbiology 12 - Wound, bone and joint infections Deck (17)
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1

What is the major pathogen involved in wound, bone and joint infections?

MRSA/ MSSA

2

What are the 3 levels of wound infection?

Superficial incisional
Deep incisional
Organ/ space infection

3

Recall 2 important risk factors for wound/ bone/ joint infection

Diabetes
Obesity (adipose tissue is poorly-vascularised)

4

What can be done during orthpaedic procedures to reduce risk of infection?

Laminar flow

5

Which patient group is particularly at risk of septic arthritis?

Those who already have rheumatoid arthritis

6

Where in the joint do organisms adhere to in septic arthritis?

Synovial membrane

7

What are the symptoms of septic arthritis?

Red, painful and swollen joint with *restricted movement*

8

What investigations for septic arthritis should be done before starting antibiotics?

1. Blood cultures
2. Synovial fluid aspiration

9

When is MRI indicated for septic arthritis patients?

When osteomyelitis is suspected

10

How is septic arthritis managed?

4-6 weeks IV antibiotics
Surgical washout

11

What are the symptoms of vertebral osteomyelitis?

Back pain and fever

12

How is osteomyelitis diagnosed?

MRI

13

How is vertebral osteomyelitis treated?

At least 6w of antibiotics

14

What is the most common pathogen implicated in prosthetic joint infections?

Coagulase negative staphylococcus

15

What would an x ray show in prosthetic joint infections?

Loosening

16

How many tissue samples are required for the lab when a patient goes to theatre for a suspected joint infection?

5 (If >3 yield same organism = infection)

17

What are the 2 options for management of prosthetic joint infection?

1. Single stage revision (removal of manky prosthesis and replacement with antibiotic-impregnated material prosthesis)

2. Two stage revision (firstly remove prosthesis and send off samples, put in a spacer, wait a few weeks, then put new prosthesis in)

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