Bone and joint

Question 1

organism that can cause a sty of the eye

Answer 1

staph. aureus

Question 2

Infectious process involving the various components of bone characterized by progressive inflammatory destruction of bone, necrosis and new bone formation

Answer 2

osteomyelitis

Question 3

how is osteomyelitis happens?

Answer 3

hemtaogenous or contigous spread

Question 4

most sensitive dx for osteomyelitis

Answer 4

MRI but it is very expensive

Question 5

what do we wee in bone biopsy in osteomyelitis?

Answer 5

• abundant WBC and bony destruction

Question 6

major pathogen in osteomyelitis

Answer 6

S. aureus

Question 7

special pathogens in osteomyelitis:

1. salmonella
2. pasteurella multocida
3. M. tuberculosis
4. fungi

Answer 7

1. salmonella- immunocompromised
2. pasteurella multocida- cat bites
3. M. tuberculosis- hematogenous spread during primary disease
4. fungi- intravenous device infections or immunosuppression

Question 8

septic arthritis

Answer 8

medical/surgical emergency due to the pus in the joint rapidly nad irreversibly destroys the joint (collagen has no blood supply thus it does not grow back)

Question 9

pathogenesis of septic arthritis (3)

Answer 9

1. hematogenous spread
2. direct inoculation
3. contigous infection

Question 10

most common cause of septic arhritis

Answer 10

gram positive: s. aureus

less likely is N. gonorrheae

Question 11

medical treatment of septic arhritis

Answer 11

for S.aureus use oxacillin

and for N.gonorrheae use ceftriaxone

Question 12

is gonorrhea seen in joint fluid aspiration?

Answer 12

nope, we should to a urine test to confirm