Extra Martin Skeletal Path 2

Question 1

What are the two most common causes of osteonecrosis?

Answer 1

Fractures or corticosteroids

Question 2

2 infarction types of osteonecrosis?

Answer 2

Subchondral and medullary

Question 3

What is not usually involved in avascular necrosis of the bone and why?

Answer 3

Cortex because it has collateral blood flow

Question 4

What is a unique morph feature to subchondral infarcts?

Answer 4

Triangular or wedge shaped infarcts

Question 5

What 3 pathogens are most commonly causing osteomyelitis in patients with UTIs or IV drug users?
What pathogen causes it if you are deficient in complement?
What two other common causing pathogens?

Answer 5

E. coli, PA, and klebsiella
N gonorrhea
H influenza and group b strep

Question 6

What does sequestrum mean in osteomyelitis?
What about involucrum?
What is a Brodie abscess?

Answer 6

Dead bone following subperiosteal abscess
New bone serves as a shell of living tissue over dead bone
Small interosseas abscesses that are walled off by reactive bone

Question 7

What is the histo of mycobacterium osteomyelitis?

What disease is is part of half the time and what is going on in the disease?

Answer 7

Caseous necrosis and granulomas

Pott disease. TB spondylitis. Permanent compression fractures in the spine.

Question 8

What is the clinical sign for congenital syphilis affecting bone?
What is the clinical sign for acquired syphilis affecting bone?

Answer 8

Saber shin, reactive bone on lower tibia

Saddle nose