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Tumors > Infection - Osteomyelitis > Flashcards

Infection - Osteomyelitis Flashcards

1
Q

What is responsible for around 90% of all bone and joint infections?

A

Staphylococcus

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2
Q

What are the 4 major pathways of spread of suppurative Osteomyelitis?

A

Hematogenous
Spread from contiguous source of infection
Direct implantation
Postoperative infection (iatrogenic)

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3
Q

What is the most common source of Osteomyelitis and is involved with UTIs and Respiratory infections?

A

Hematogenous Spread

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4
Q

What age and gender is most susceptible to suppurative osteomyelitis?

A

2-12 year old males

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5
Q

What type of bones does suppurative osteomyelitis affect?

A

large tubular bones

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6
Q

What makes the radiologic and pathologic features of osteomyelitis differ in the infant, child, and adult?

A

blood supply of growth centers

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7
Q

What does periosteal and subperiosteal area results in?

A

necrosis of cortex

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8
Q

What do Cortical and medullary infarcts result in?

A

Sequestrum

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9
Q

What is a significant radiographic feature of infection of the periosteum due to infection and pus in the bone causing new bone formation?

A

involucrum

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10
Q

What is a defect in the involucrum known as?

A

Cloaca

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11
Q

What is a cloaca commonly associated with?

A

Chronic Osteomyelitis

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12
Q

What is a malignant degeneration of a chronic wound or scar that is commonly seen in squamous cell carcinoma?

A

Marjolin Ulcer

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13
Q

What imaging should you order when you suspect infection?

A

MRI with and without Gadollinum contrast

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14
Q

What percentage of infections involve extremities? Spine?

A

Extremities: 90%
Spine: 10%

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15
Q

If infection affects the spine, what part of the spine is most commonly affected?

A

Lumbar Spine

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16
Q

What age is mostly predisposed to spinal infection?

A

<20 year olds

17
Q

What does Adult Spondylitis infection most commonly affect in the spine?

A

anterior vertebral endplate

18
Q

What part of the spine will you see widening of retropharyngeal and retrotracheal spaces?

A

Cervical spine

19
Q

What part of the spine will you see displacement of paraspinal lines?

A

thoracic spine

20
Q

What part of the spine will you see paravertebral or psoas abscesses?

A

Lumbar spine

21
Q

What is a localized aborted form of suppurative osteomyelitis that is associated with nocturnal limb pain that is relieved by aspirin?

A

Brodie’s Abscess

22
Q

Who does Brodie’s abscesses most commonly affect?

A

male children

23
Q

Where in the body does Brodie’s abscess most commonly appear at?

A

Distal and proximal tibia

24
Q

What bacteria is most commonly associated with Brodie’s abscess?

A

Staphylococcus aureus

25
Q

What bacteria is most commonly associated with Chronic Osteomyelitis?

A

Staphylococcus aureus

26
Q

In regards to TB, infection of the musculoskeletal system is commonly caused by what?

A

hematogenous spread of primary pulmonary focus

27
Q

What is a common characteristic symptom of TB?

A

Pott’s Paraplegia: sudden onset of lower limb paraplegia

Pott’s Disease

28
Q

What age does non-suppurative osteomyelitis of TB affect?

A

<5yo

29
Q

What is the key characteristic with Pott’s disease?

A

erosion of anterior vertebral body endplate

30
Q

How does TB and Pott’s disease spread in the spine?

A

Batson’s plexus

31
Q

What part of the spine does Pott’s disease in regards to TB most commonly seen? What specific level?

A

lower thoracic and upper lumbar spine

MC: L1

32
Q

What type of deformity can Pott’s disease lead to in children?

A

Gibbus Deformity

33
Q

What part of the body does Tubercular arthritis most commonly affect?

A

hip and knee

34
Q

Where does Tubercular arthritis begin and spread to?

A

Metaphysis to adjacent joint

35
Q

What type of radiographic lesion is associated with Tubercular arthritis?

A

Moth-eaten lesion

36
Q

What is the end-stage of Pott’s disease?

A

fibrous ankylosis of joint

37
Q

What is another name for Pott’s Disease?

A

Tubercular spondylitis

38
Q

Does Pott’s disease usually affect unilateral or bilateral SI joints?

A

Unilateral

39
Q

What is a key radiographic feature of Tuberculous Dactylitis?

A

spina ventosa

Tumors (8 decks)

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