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Flashcards in Infectious arthritis Deck (40)
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1

What are the types of infectious arthritis

Bacterial, viral, fungal, parasitic, mycobacterial, Lyme Disease, Rheumatic fever, HIV associated

2

Acute bacterial arthritis usually affects what parts of the body?

Usually a=only affects one joint, the knee

3

How does bacterial arthritis most commonly get in the joints?

hematogenous seeding of the synovial membrane. Remember that the joint space is rich in vasculature and lacks a basement membrane, both of which allow organisms easy access to joints

4

BEsides hematogenous seeding, what is another route of spread for bacterial arthritis?

Contiguous spread from a bursitis, cellulitis, or osteomyelitis

5

Note: Bacterial arthritis is a medical emergency.

YES IT IS

6

What is the least common, and third type, or spread for bacterial arthritis

From penetrating trauma (cat bite, nail, plant, thorn, etc..) something that is penetrating into the joint.

7

Two categories of bacterial arthritis?

Gonococcal and Non-gonococcal

8

What is the major virulence factor for N. Gonorrhaea

Protein 1A. I

9

What does protein 1A do?

It inactivates the hosts complement system
It also prevents phagosome lysosome fusion in neutrophils which means that gonorrheae can stay alive inside the phagosome.

10

Clinica presentation of disseminated gonococcal arthritis?

Migrating arthritis. These patients get tenosynovitis of wrists, ankles, fingers, toes. They also have dermatitis and a fever in most cases.

11

What type of patient presents with disseminated gonococcal arthritis?

Usually the pt is young and healthy. Usually sexually active.

12

Are blood cultures a good way to test for disseminated gonococcal arthritis?

NO! Bllod cultures are rarely positive.

13

Be sure to recognize the skin lesion from disseminated gonococcal arthritis

ok

14

What are teh major risk factors for non gonococcal arthritis?

Since this is not related to gonorrhaea, it is not sexually transmitted.
- Non-gonococcal arthritis is most common in people who have predisposing co-morbidity, such as diabetes, renal failure, HIV,hemophilia, etc...
- Another predisposing factor would be recent joint surgery, a skin infection, an immunosuppresed state. etc...
-IV DRUG USE

15

What is the most common cause of non-gonococcal arthritis infection?

Staph aureus, followed by streptococcus, after this is gram neg bacteria

16

Most common cause of prosthetic joint infection is

coagulase negative staph aureus

17

Most common cause of non-gonococcal arthritis in IV drug abusers is?

Pseudomonas and candida

18

In sickle cell anemia, what is the most common cause of non-gonococcal arthritis?

Salmonella

19

Virulence factors of Staph aureus

Collagen binding protein
Clumping factor A and B
protein A
Toxic shock syndrome toxin-1
Enterotoxins

20

Clinical presentation of non-gonococcal arthritis

Monoarticular, Usually affects large joints like knees and hips.
Patients will generally appear sick,,,they have a fever

21

What MUST you do with bacterial arthritis?

ASPIRATE because bacterial arthritis will generally have purulent synovial fluid.

22

What other lab signs will bacterial arthritis include?

Very low glucose, gram positive in 60-80% of cases

23

What is the most common cause of viral arthritis in the US

Parvo B19

24

Common presentation of Parvo B19

- Slapped cheek
- PIP swelling, MCP swelling, knee, ankle

25

Rubella presentation

Catcher Crouch syndrome

26

Why do children with Viral arthritis due to rubella frequently present with this catcher crouch syndrome>

It is generally due to a lumbar radiculopathy

27

What cause of viral arthritis is generally mosquito borne

alpha virus

28

Lets say a pt shows up at the office and says they had severe and sudden onset of knee pain that went away but was followed by jaundice

This is hepatitis B that caused a viral arthritis. The joint inflammation, generally in the knee, will be explosive but will go away when the jaundice arrives

29

Traditional presentation of hepatitis C arthritis

polyarthritis of small joints (hands, wrists, knees)

30

What bacteria causes lyme dz

Borrelia burgdorferi