Bone and Joint Infection Flashcards

1
Q

What does “calor” mean?

A

Heat

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2
Q

What does “dolor” mean?

A

Pain

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3
Q

What does “tumor” mean?

A

Swelling

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4
Q

What does “rubor” mean?

A

Redness

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5
Q

What does “functio laesa” mean?

A

Loss of function

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6
Q

What is important when getting specimen from hip infection?

A

To have x-ray control

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7
Q

What two blood tests used together are useful for infection?

A

CRP and Plasma viscosity

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8
Q

What can bone scans show/measure?

A

Osteoblasts

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9
Q

What can MRI show in infection?

A

Can see pus on MRI picture - ABCESS

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10
Q

On MRI, what colour would inflammation show up?

A

White

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11
Q

Is acute osteomyelitis common in UK?

A

No, pretty rare in UK, but v common in some other countries

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12
Q

Where does acute osteomyelitis in children or immunosuppressed come from?

A

“Haematogenous”

originating in or carried by the blood.

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13
Q

What does Haematogenous mean?

A

Originating in or carried by the blood.

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14
Q

What is the cause of MOST cases of acute osteomyelitis? (method of infection)

A

Post-traumatic/open wound

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15
Q

Which organism is the cause of MOST cases of acute osteomyelitis? (adults)

A

Staph aureus

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16
Q

Which organism is the cause of most cases of acute osteomyelitis IN CHILDREN?

A

Haemophilus

17
Q

What are the three factors of Virchow’s Triad?

A

Endothelial Injury
Stasis of Bloodflow
Hypercoagulability

18
Q

Can you treat abcess with antiobiotics alone?

A

No

if there’s any pus, let it out

19
Q

Are bloodtests helpful with chronic osteomyelitis?

A

Often not

Plain X rays and MRI more helpful

20
Q

What is an INVOLUCRUM?

A

A layer of new bone growth outside existing bone. It results from the stripping-off of the periosteum by the accumulation of pus within the bone, and new bone growing from the periosteum.

21
Q

In an involucrum, what is producing new bone?

A
The PERIOSTEUM
(a dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints)
22
Q

Is septic arthrits an emergency?

A

YES

23
Q

What are the causes of septic arthritis? (method of infection)

A

Inoculation
Metaphyseal spread
Direct haemaatogenous

24
Q

What does gas in tissue on x-ray show?

black spots

A

That there’s a as-forming organism inside tissue - Necrotising fasciitis (will kill quickly)

25
Q

What is a curette used for?

A

Biopsy and drainage

26
Q

What is “debridement”?

A

The removal of damaged tissue or foreign objects from a wound.

27
Q

What is discitis?

A

Septic arthritis of intervertebral disc space

can occur in children

28
Q

Is infected arthroplasty a deep infection or a superficial wound problem?

A

Deep infection

29
Q

What is “arthroplasty”?

A

The surgical reconstruction or replacement of a joint.

30
Q

What tests would you conduct for an infection arthroplasty?

A

CRP
Joint aspiration
Bone scan (Technetium 99)
X Ray

31
Q

What are “biofilms”?

A

A thin but robust layer of mucilage adhering to a solid surface and containing a community of bacteria and other microorganisms.

A lot of infections are from commensals which form slime and are gram positive.

Common in the oil industry

32
Q

If there’s pus in an infected joint, how do you treat?

A

Let pus out!

33
Q

What measures are taken to prevent “bad air” getting into a wound, reducing risk of infection, during surgery?

A

“Clean air theatres”

34
Q

What prophylactic measures taken to prevent infection of wounds?

A
Clean air theatres
Local antibiotics
Systemic antibiotics
Duration of surgery considered
Neat surgery
Quality of hand washing considered
Theatre discipline
35
Q

Which bugs commonly cause infected prosthesis?

A
Staph aureus (SA)
Staph epidermidis (SE = Coagulase Negative Staphylococcus (CNS)