Witwer - Arthritis

Question 1

avascular necrosis is mc seen in the

Answer 1

femoral head

Question 2

femoral head has poor

Answer 2

collateral circulation

Question 3

what artery supplies the ligament of the head of the femur

Answer 3

ligamentum teres

Question 4

what artery is compromised in avascular necrosis of the femoral head

Answer 4

medial circumflex

Question 5

common causes of avascular necrosis

Answer 5

trauma

vasculitis

vasospasm

microemboli

steroids

etoh

pancreatitis

dialysis

Question 6

avascular necrosis can cause

Answer 6

collapse and flattening of the femoral head

Question 7

osteonecrosis of subchondral bone fx

edematous changes

Answer 7

avascular necrosis

Question 8

best imaging for avascular necrosis

Answer 8

MRI

Question 9

what is this showing

Answer 9

flattening of femoral head → osteonecrosis

subchondral fx → buckling of trabeculae

avascular necrosis

Question 10

besides the circumflex arteries, what other arteries can affected in AVN

Answer 10

artery to ligamentum teres → branch of the obturator a

Question 11

AVN of the femoral head is mc dt damaged __ a,

but can also be caused by damage to the __ a

Answer 11

medial circumflex

obturator

Question 12

what do you think when you see charcot’s joint

Answer 12

neuropathic arthropathy

Question 13

neuropathic arthropathy is seen w.

Answer 13

peripheral neuropathies

Question 14

what do you think when you see, extensive bony destruction of articular surfaces, bony fragmentation, osteophytosis, sclerosis

Answer 14

neuropathic arthropathy/charcot’s joint

Question 15

what is this showing

Answer 15

neuropathic joint

Question 16

inflammation of multiple articular and periarticular sites in the spine

Answer 16

ankylosing spondylitis

Question 17

enthesiopathy w. calcification and ossification of ligamentous, capsular, and tendonous attachments to spine

Answer 17

ankylosing spondylitis

Question 18

ankylosing spondylitis creates a __ of the spine

Answer 18

fusion

Question 19

what do you think when you see, bamboo spine

Answer 19

ankylosing spondyitis

Question 20

what is this showing

Answer 20

sacroilitis w. subchondral sclerosis and erosions

→ ankylosing spondylitis

Question 21

what is this showing

Answer 21

fusion of the sacroiliac joints → ankylosing spondylitis

Question 22

what is this showing

Answer 22

bamboo spine → ankylosing spondylitis

Question 23

reiter’s syndrome is associated w.

Answer 23

reactive arthritis

Question 24

what do you think when you see, arthritis, conjunctivitis, or uveitis/urethritis

Answer 24

reiter’s syndrome → reactive arthritis

Question 25

what is this showing

Answer 25

severe erosive changes w. subluxations → **reactive arthritis**

Question 26

complex regional pain syndrome is same-same

Answer 26

reflex sympathetic dystrophy

Question 27

what do you think when you see, hyperemia, swelling of limb, and increased blood flow

Answer 27

regional pain syndrome

Question 28

on plain films, complex regional pain syndrome appears as (2)

Answer 28

osteopenia swelling

Question 29

complex regional pain syndrome is mc caused by

Answer 29

trauma

Question 30

what is this showing

Answer 30

complex regional pain syndrome

Question 31

what is this showing

Answer 31

regional pain syndrome

Question 32

3 phases of complex regional pain syndrome

Answer 32

1. blood flow 2. blood pool 3. bones

Question 33

how does hemophilia affect joints

Answer 33

bleeding into joint

Question 34

mc joint affected by hemophilia

Answer 34

knee

Question 35

articular changes 2/2 to recurrent hemorrhages, destruction of cartilage, bony destructive changes, subchondral cysts

Answer 35

hemophilia

Question 36

what is this showing

Answer 36

eroded cartilage, subchondral cysts, hemosiderin deposition → ## Footnote **hemophilia**

Question 37

what is this showing

Answer 37

spondylolisthesis

Question 38

defect in the pars interarticularis

Answer 38

spondylolysis

Question 39

on plain film, the neck of the scotty dog is the

Answer 39

pars interarticularis

Question 40

when you see, no neck scotty dog, think

Answer 40

spondylolysis