MSK 3: Large Animal

Question 1

which oblique view is this and why?

Answer 1

this is a DMPLO because: the accessory is superimposed with other structures, and metacarpal II is shown without superimposition

Question 2

what oblique view is this and why?

Answer 2

this is a DLPMO because the accessory is highlighted, and metacarpal IV is highlighted. If confused, look at page 350 of the textbook for some lovely images.

Question 3

why is it useful to take a DP 30 view rather than just a DP?

Answer 3

because it raises the sesamoids up to see the fetlock joint/joint space better

Question 4

which is DMPLO and whch is DLPMO and why?

Answer 4

Using the markers: one on the left is DMPLO and the one on the right is DLPMO. With the fetlock, you can’t tell without the markers, these views will look extremely similar so make sure to label them properly!!

Question 5

what pathlogy/disease are you worried about here?

Answer 5

osteoarthritis: can see bone proution and not a ton of bone lysis

Question 6

which one is septic arthritis and which is osteoarthritis?

Answer 6

the one on the left is ostearthritis because there is new productive bone lesions with minimal lysis, and the one on the right is septic arthritis because there is more lysis. subchondral bone lesions, and less productive bone lesions (apparently)

Question 7

how to tell between septic arthritis and septic physitis?

Answer 7

septic physitis only usually affects one side of the bone and it’s more obviously associated with the physis

Question 8

what pathology is seen here?

Answer 8

septic physitis (apparently)

Question 9

WOT

Answer 9

a foot abscess, can see the gas pockets from the bacteria

Question 10

which is a chip fracture and which is a slab fracture? Which has worse prognosis?

Answer 10

left is slab fracture
right is chip fracture
worse prognosis with slab fracture since it’s biarticular

Question 11

which is DLPMO and which is DMPLO and why?

Answer 11

the one on the left is DLPMO because: the calcaneus has little superimposition, can see the “M” of the trochlear ridges nicely, and metatarsal IV is highlighted

the one on the right is DMPLO because: the calcaneous has more superimposition, the lateral trochlear ridge is highlighted, and metatarsal II is highlighted

Question 12

wot dis

Answer 12

OCD

Question 13

what view is this/how is this shot?

Answer 13

shot from caudal to cranial

Question 14

point out the lateral and medial trochlear ridge of this equine stifle

Answer 14

orange is medial, pink is lateral

Question 15

how is this view shot?

Answer 15

caudo-lateral to cranio-medial

Question 16

how does septic arthritis of the foot usually happen and what are seom radographic signs to look for?

Answer 16

usually happens via a penetrating injury, from an injection, or via hematogenous spread.

signs to look for:
- joint effusion/inflammation
- focal enlargement/buldging at the joint
- thinning of the joint space
- deeper infections: subchondral bone lysis and new periosteal bone formation

Question 17

what are the 3 radiographic signs of laminitis?

Answer 17

• palmar deviation/rotation of P3
• vertical sinking (increased founder distance)
• a thin sole

Question 18

what are some radiographic signs of osteoarthritis?

Answer 18

• osteophytes/new bone formation @ periarticular margin (which just means near the joint)
• enthesophytes at the site where supporting ligaments insert
• sclerosis of subchondral bone
• subchondral bone lysis/resorption
• soft tissue swelling (not always)

Question 19

what are some radiographic signs of white line disease/foot abscess?

Answer 19

• discrete areas of lysis
• irregular margins
• decreased opacity of P3
• gas may be present (lucency)