Infectious and Neoplastic Diseases

Question 1

Most common cause of osteomyelitis in adults

Answer 1

Staph aureus

Question 2

What dz can mask osteomyelitis?

Answer 2

DM

- If foot ulcer is >2x2cm, suspect osteomyelitis

Question 3

How to diagnose osteomyelitis?

Answer 3

Blood culture or need aspiration/bone bx

Question 4

Triad of signs seen on xray of osteomyelitis

Answer 4

Demineralization
Periosteal reaction
Bone destruction

Question 5

Why is it important to treat osteomyelitis?

Answer 5

To avoid SEPSIS

Question 6

Who is at risk for septic arthritis?

Answer 6

Underlying joint dz (RA) or immunosuppressed

Question 7

What is the most common cause of monoarticular arthritis? This can be migratory

Answer 7

Gonorrhea

Question 8

How to diagnose septic arthritis

Answer 8

Arthrocentesis, joint fluid aspirate

Question 9

Most common bone malignancy in adolescents

Answer 9

Osteosarcoma

Question 10

Chondrosarcoma

Answer 10

CA of cartilage

Question 11

Osteochondroma

Answer 11

Benign bone tumor, begins in childhood

Question 12

Cause of Ewing’s sarcoma

Answer 12

After radiation or chemo

Question 13

What is seen on xray of osteosarcoma

Answer 13

“Sun ray/burst”

Question 14

What is seen on xray of Ewing’s sarcoma

Answer 14

“Onion peel”

Question 15

What is seen on xray of Chondrosarcoma

Answer 15

Ring and arc appearance

Question 16

What is seen on xray of Osteochondroma

Answer 16

Grows away from growth plate

Question 17

What is important about Baker’s cyst?

Answer 17

Can mimic a DVT (calf pain)