OCD

Question 1

What would we see if a 4mo foal has OCD?

Answer 1

thickened cartilage

cyst-like changes

degeneration of cartilage

uncalcified cartilage not vascularized

cracks in pathological cartilage

Question 2

What would we see in a horse >1year old?

Answer 2

_Subchondral_ _fibrosis_
(*crack starts to get filled in w/fibrocartilage; mechanically inferior; collagen **type** **I** mainly*)
collagen **Type** **II** is major in healthy joint cartilage

sclerosis of subchondral bone
(laying down more bone makes it lose its “springiness”)

_osteophyte_ _formation_
(attempts to stabilize - lays down bone *surrounding* the joint)

Question 3

Term for process of abnormal bone & cartilage ​formation

Answer 3

Osteochondrosis

Question 4

T or F:

low Ca2+ and hi P- is a nutritional factor that may contribute to degenerative osteoarthritis.

Answer 4

TRUE

Question 5

What is the primary clinical sign for degenerative OA?

Answer 5

synovial effusion

bog spavin: excess fluid in the tarsal crural joint

Question 6

Term for lesions that penetrate the joint surface,
creating inflammation & effusion

Answer 6

Osteochondritis Dissecans (OCD)

Question 7

T or F:
vit A & D deficiency can be a contributing factor to degenerative OA

Answer 7

true

Question 8

Which joint is the most frequently affected by degenerative OA in the horse?

Answer 8

TT joint (hock)

THEN…
—>stifle—>fetlock—>cervical vertebrae—>shoulder

Question 9

Most common location in the hock joint to be affected by degenerative OA?

Answer 9

distal intermediate ridge of tibia

then…
—>lat.trochlear ridge
—>med.trochlear ridge—>med.malleolus—>lat.malleolus

Question 10

Most frequent sites of degenerative OA in the stifle?

Answer 10

lateral trochlear ridge—> med.trochlear ridge
—> med.femoral condyle (cyst formation)

Question 11

Most common sites of degenerative OA in the fetlock?

Answer 11

sagittal ridge of distal cannon bone (MC III)
—>Fxs: caudal (palmar/plantar) eminence of P1
–>cyst: P1 or MCIII