Bone Infections Flashcards Preview

MSK > Bone Infections > Flashcards

Flashcards in Bone Infections Deck (21)
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1
Q

what are the features of inflammation

A
rubor
calor
dolor
tumor
functio laesa
2
Q

what blood tests are the most useful

A

CRP and PV- show inflammation

3
Q

what blood tests are occasionally useful

A

blood cultures, white cell count, ESR

4
Q

what is a brodies abscess

A

a subacute osteomyelitis, which may persist for years before converting to a frank osteomyelitis

5
Q

what does a technetium scan do

A

osteoblast activity

6
Q

how can MRI help in infection

A

shows puss, inflammatory processes and water content

7
Q

who gets osteomyelitis

A

post traumatic/ open fracture (inoculation)

children/ immunosuppresed (haematogenous)

8
Q

what are the most common causative agents of acute osteomylelitis

A

staph aureus

haemophilus in children

9
Q

how can a minor trauma cause acute osteomyelitis

A

damages sinusoidal vessel causing a thrombosis in metaphysis

10
Q

what happens in chronic osteomyelitis

A

sclerotic changes due to osteoclast activity cause bone death over a wide area (sequestrum) which causes a lifted periosteum

11
Q

what tests can be done in osteomyelitis

A

blood tests often UNhelpful

plain x rays and MRI

12
Q

why can osteomyelitis be chronic

A

as bugs can be dormant

13
Q

what is am involucrum

A

involucrum (plural involucra) is a layer of new bone growth outside existing bone seen in pyogenic osteomyelitis. It results from the stripping-off of the periosteum by the accumulation of pus within the bone, and new bone growing from the periosteum

14
Q

how can bugs gets into the joint in septic arthritis

A

inoculation
metaphyseal spread
direct haematogenous

15
Q

what are gas forming organisms in soft tissue associated with

A

necrotising fascitis

16
Q

when should you operate in soft tissue infections

A

if there is dead tissue or a foreign body

17
Q

what tests should be done in suspected infected arthroplasty

A

CRP
joint aspiration
bone scan (technetium 99)
X ray

18
Q

what do you need to do if there is pus

A

let it out

19
Q

what is more effective in control of infection- one or two stage surgery

A

two stage (90-80%)

20
Q

what are the prophylaxis for arthroplasty surgery

A

laminar flow of air
24 hours antibiotics
antibiotics in cement

21
Q

prophylaxis for arthroplasty/ bone surgery is to target which two bug inparticular

A

staph aureus

staph epiderms (CNS= coagulase negative streptococcus)

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