Osteomyelitis

Question 1

Kids

Answer 1

Acute OM often in metaohysis in kids as static blood

Question 2

BS

Answer 2

10% BS from endostium from nutrient A- cut off in infec due to incr press.
90% from periost soft tiss

Question 3

Features of chronic osteomyelitis

Answer 3

-sequestrum
Periost stripping in infec causes nec and sequestrum formation.
In infec/tum periost lays bone on top of it when raised, get calcific of BV below causing sunblast app and codmans triangle.
-involucrum
New bone formation

Question 4

Comm sites of septic arth from local spread

Sites with intra artic epiph as infec can spread to synov cav

Answer 4

Bones with necks eg 
Femur
Radius
Fibula
Humerus

Question 5

Sources of infec

Answer 5

Commonly haematogenous- septacaemia or local.

Adjacent invading

Question 6

Causative orgs in neon

Answer 6

Haemophilus

Gram neg anaer eg eneterobacter

Question 7

Causative orgs in IV drug users

Answer 7

Pseudomonas

Question 8

Human bite bacteria

Answer 8

Eikenella corrodens

Question 9

dog bite bacteria

Answer 9

Pasteurella multocida

Question 10

causative orgs in sickle cell anaem

Answer 10

Salmonella

Question 11

Prosthetic infec orgs

Answer 11

Coag neg staph
Corynebacterium
Propionibacterium
Ecoli

Question 12

causative orgs in imm comprom

Answer 12

Bartonella
?hansella
Pseudomonas

Question 13

Mx

Answer 13

IV flucolox of vanc while await cult

Question 14

XR

Answer 14

Sequestrum- separated dead bone
Involucrum- thick new periost on top
Codman- raised periost with bone format under
Sunblast- aggress periost reac, often osteosarcoma.