Introduction to Bone and Skeletal Diseases of Young Subjects Flashcards Preview

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Flashcards in Introduction to Bone and Skeletal Diseases of Young Subjects Deck (44):
1

osteoblasts 

bone developement

synthesis of osteoid

2

osteoclasts are responsible for 

bone resorption

3

how many days between osteoid formation and mineralization

12 - 15

4

what is an apophysis

secondary center of bone formation that provides a point for muscle attachement

5

predilection site for panosteitis and fractures 

diaphysis

6

which disease have a predilection for the metaphysis

osteosarcoma

hematogenous infections

hypertrophic osteodystrophy

7

osteochondrosis and osteophytes have a predelection for...

epiphysis

8

what are respposible for remodeling and growth of bone cortex, osteogenesis during fracture repair and remain active throughout life 

osteoprogenitor cells found in the endosteum and periosteum 

9

intramembranous ossificaton occurs in 

flat bones of skull

10

name the lesion

Metatarsal sequestrum 

caused by distruption of periosteal blood supply (i.e. wire cut) with necrosis due to poor communication with endosteal blood supply

11

fracture detected or not detected

not detected

nutrient foramen - don't confuse with fracture 

12

what is wolff's law

bone will respond to the stresses or strains placed (or not placed on it)

13

what is needed to evalulate soft tissues when using film

"hot light"

14

T/F secondary degenerative joint disease is common and may mask the orginal lesion

True

15

what Dz is common in young, rapidly growing large breed dogs resulting from a failure of endochondral ossification

osteochondrosis and osteochonditis dissecans (OCD)

16

what is the difference between osteochrondrosis and osteochrinritis dessecans

OCD - there is a chondral or osteochondral fragment

splitting hairs - often can't see the fragments 

17

predilection sites for OC and OCD

caudal humeral head

medial humeral condyle

lateral and medial femoral condyle

lateral and medial trochlea of talus (medial more common)

18

radiographis signs of OC and OCD

flattening or concavity of subchondral bone

adjacent sclerosis

+/- mineralized flap

19

what be these?

"Joint Mice"

necrotic cartilage breaks free, can attach to synovium and become vascularized

associated with OC and OCD

20

what are the triad of developmental lesions associated with elbow displasia

ununited anconeal process

fragmented medial coronoid process

osteochondrosis of humeral chondyle

21

T/F incongruity can easily be Dx radiographically

False

difficult to Dx on rads, CT an arthroscopy more accurate 

22

ununited anconeal process detected or not detected 

Not detected

normal secondary center - presence not a predictor of  UAP

23

name the lesion indicated by the red arrow

ununited anconeal process

24

Tx of ununited anconceal process

medical management - not as effective

removal

fixation + ulnar osteotomy

25

how early can signs of fragmented medial coronoid process be seen 

4 - 6 months

26

what is needed to Dx fragmented coronoid process

CT

medial coronoid process superimposed on radius and ulna in each view, fragment plane rarely struck head on by x ray beam 

27

what is the main radiographic sign of fractured medial coronoid process

new bone formation on proximal aspect of anconeal process

28

DDx for kissing lesion

distal humeral OD 

29

FCP detected or not detected 

Detected

30

clinical sign associated with panosteitis

shifting leg lameness

31

radiographic signs of panosteitis

increased medullary opacity - nodular→diffuse

lesion often begins at nutrient foramen

smooth, continuous periosteal new bone - minority of patients

cortical thickening - persist

32

name the lesion

panosteitis

33

what is a developmental systemic disease of rapidly growing young, large breed dogs (7wks-8months)

hypertrophic osteodystrophy

34

which is the only breed where the entire litter is effected by hypertrophic osteodystrophy

weimaraner

35

clinical signs associated with hypertrophic osteodytrophy 

mild self limiting to severe, multisystemic, life threatening illness

pyrexia

malaise

pain + swelling over metaphyseal region 

lameness

other non specific signs

36

radiographic signs of Hypertrophic osteodystrophy

"double physis" sign 

advanced stages - irregular periosteal new bone formation along metaphysis, physeal closure of retarded growth

37

what is indicated by the arrows

"Double physis" sign

hypertrophic osteodystrophy 

38

corticosteroids are more/less effective than NSAIDs in the treatment of hypertrophic osteodystrophy 

More

suggests immune suppression may be important

39

Aseptic Necrosis of Femoral Head (Legg-Calve-Perthes)

adolescent toy and small breed dogs

compromised blood suppply to femoral head causes necrosis while overlying cartilage continues to grow

revascularization will occur

40

radiographic signs of Legg-Calve-Perthes

varies

lysis of femoral head/neck

widening od joint space (hyperplasic cartilage) 

microfracture and deformation of femoral head 

2º DJD and musle atrophy

41

what dis

spontaneous capital physis fracture in cat

42

tibial crest avulsion detected or not detected

Not detected

43

name the lesion indicated by the arrow

incomplete humeral condyle ossification

44

what dis?

flexor enthesopathy in canine elbow

 not visable on CdCr view